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2012 Mongoose Kos Kruiser Tandem 26  RSS Feed

#1 2011-11-21 9:27am

bmxmarty
Pro Member
From: Hella NorCal
Registered: 2007-07-22
Posts: 200
Bikes: 48
For Sale: 35

2012 Mongoose Kos Kruiser Tandem 26

https://bmxmuseum.com//image/dr35dab89d1cf082.jpg https://bmxmuseum.com//image/ndf15dab89d37e818.jpg https://bmxmuseum.com//image/d65dab89d151fb5.jpg https://bmxmuseum.com//image/d45dab89d0cb8ae.jpg https://bmxmuseum.com//image/e15dab89d2d46b3.jpg https://bmxmuseum.com//image/b15dab89d050ffd.jpg https://bmxmuseum.com//image/drr15dab89d25686f.jpg https://bmxmuseum.com//image/kos-tandem15dab89d35d5e2.jpg

2012 Mongoose Kos Kruiser Tandem 26

Modern twist on a rare classic

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1. Tandem's serve a great function, but they do have some drawbacks. In my case, the first drawback was that most of them don't fit kids. Second was that I didn't want a road bike tandem, mountain bike tandem, beach cruiser tandem, or any other kind of tandem I'd ever seen other than the 1980's Kos tandem (pictured above - not mine) and the Metal Bikes tandem that Odyssey and Jimmy Levan built for InterBike a few years back.

2. Those two were what I wanted. This decision had a couple of problems associated with it, namely that the likelihood of my getting either one was slim-to-none and even if I did, it still wouldn’t solve the dilemma of kids not being able to ride it.

3. Next I decided that with over 30,000 members on BMX Museum, even if only 0.5-percent of those folks have kids that they want to ride with but aren’t always able to based on factors like destination, route, distance, etc., there’s at least 150 people here who’ve had the same thoughts as me.

4. Those 150 people would have an appreciation for, and possible desire to purchase, a tandem that checked the right boxes.

5. If the emotional connection to bikes that allow us to remember our youth is enough to get folks to cough up nearly 2 Grand for a pair of cranks that some factory guys couldn’t be paid to ride, and sharing that connection with your kids creates a stronger family bond, then building this bike is not insane.

You on the other hand, may just have a hot girlfriend who doesn’t know how to ride a bike. Either way, this bike had to be built.

In case you’re staring at the bizarre drivetrain, I can explain. The lower rear BB shell uses an eccentric BB, which allows the upper and lower rear BB’s to have proper chain tension. The “floating” chainring creates tension between the lower front and rear BB’s.
The idea with this set-up is that, with small kids you install the rear pedals on the upper cranks, and with anyone bigger, you run it like a standard tandem, and and install the pedals on the lower crankset.


Here’s a list of answers to questions I know will be asked of me:

Q: Are you insane?
A: Aren’t we all?

Q: Do you work for Mongoose?
A: Maybe. If you want one for free, then no, I don’t.

Q: Is this a production bike?
A: Unfortunately not.

Q: Are you insane?
A: Me? Didn’t you just ask me that like 20 seconds ago?

Q: Can you build me one?
A: Maybe. Go find 50 of your closest pals who are willing to buy it 12+ months in advance of production. Do it now.

Q: How much would it cost?
A: More than a NOS set of full-wrap single-pinch Flights, and less than three pairs of NOS magnesium Motomags.

Q: What age range is the rear designed to fit?
A: From your 5-year old to his Great-Grandma.

Q: Are you insane?
A: Do you have a concussion or something?


A few more Kos friends in my bike family:
[url=http://bmxmuseum.com/bikes/mongoose/69099]
[/url]Trans-Am-inspired Metallic Brown Kos Krusier: https://bmxmuseum.com/bikes/mongoose/57223[url=http://bmxmuseum.com/bikes/mongoose/57223]
[/url]V1 Prototype Kos Kruiser: https://bmxmuseum.com/bikes/mongoose/105156

Kid Kruiser: https://bmxmuseum.com/bikes/mongoose/70124

White Kos Kruiser: https://bmxmuseum.com/bikes/mongoose/69099
<b> <p class="MsoNormal">Six months ago I decided several things.<br /> <br /> 1. Tandem's serve a great function, but they do have some drawbacks. In my case, the first drawback was that most of them don't fit kids. Second was that I didn't want a road bike tandem, mountain bike tandem, beach cruiser tandem, or any other kind of tandem I'd ever seen other than the 1980's Kos tandem and the Metal Bikes tandem that Odyssey and Jimmy Levan built for InterBike a few years back.<br /> <br /> 2. Those two were what I wanted. This decision had a couple of problems associated with it, namely that the likelihood of my getting either one was slim-to-none and even if I did, it still wouldn’t solve the dilemma of kids not being able to ride it.<br /> <br /> 3. Next I decided that with over 30,000 members on BMX Museum, even if only 1-percent of those folks have kids that they want to ride with but aren’t always able to based on factors like destination, route, distance, etc., there’s at least 150 people here who’ve had the same thoughts as me.<br /> <br /> 4. Those 150 people would have an appreciation for, and possible desire to purchase, a tandem that checked the right boxes.<br /> <br /> 5. If the emotional connection to bikes that allow us to remember our youth is enough to get folks to cough up nearly 2 Grand for a pair of cranks that some factory guys couldn’t be paid to ride, and sharing that connection with your kids creates a stronger family bond, then building this bike is not insane.<br /> <br /> You on the other hand, may just have a hot girlfriend who doesn’t know how to ride a bike. Either way, this bike had to be built.<br /> <br /> Since these photos were taken a couple things have been tweaked. There is no longer chimney flashing and duct tape acting as a shim for the rear seat post clamp, the rear bars are higher, the seats are now color matched. That’s about it. Wheels are still mismatched, rear cranks are still too long for a 6-year old, but I can honestly say I have a good excuse: The amount of fun my son has had riding this with me has taken all priority off the details of getting it perfectly dialed because time spent working is time not spent riding.<br /> <br /> In case you’re staring at the bizarre drivetrain, I can explain. The empty BB shell is made to fit an eccentric BB, however it still needs to be machined for the eccentric assembly to fit in. Once installed, the eccentric will allow a standard tandem drivetrain set-up to be used with the eccentric creating chain tension between the fixed points. There will be an additional chain linking the upper and rear cranks. For now, the freakish set-up you see here is getting it done.<br /> <br /> Here’s a list of answers to questions I know will be asked:<br /> Q: Are you insane?<br /> A: Aren’t we all?<br /> <br /> Q: Do you work for Mongoose?<br /> A: Maybe. If you want one for free, then no, I don’t.<br /> <br /> Q: Will this be a production bike?<br /> A: Unlikely as of now. If so it would be in very limited numbers.<br /> <br /> Q: Are you insane?<br /> A: Me? Didn’t you just ask me that like 20 seconds ago?<br /> <br /> Q: Can you build me one?<br /> A: Maybe. Go find 50 of your closest pals who are willing to buy it 6+ months in advance of production. Do it now.<br /> <br /> Q: How much would it cost?<br /> A: Probably more than a cherry set of full-wrap single-pinch Flights, and less than a pair of NOS magnesium Motomags.<br /> <br /> Q: What age range is the rear designed to fit?<br /> A: From your 5-year old to his Great-Grandma.<br /> <br /> Q: Are you insane?<br /> A: Do you have a concussion or something?</p><p class="MsoNormal"> </p><p class="MsoNormal">A few more Kos friends in my bike family:</p><p class="MsoNormal"> </p><p class="MsoNormal">White Kos Kruiser: <a href="http://bmxmuseum.com/bikes/mongoose/69099">http://bmxmuseum.com/bikes/mongoose/69099<br /> </a>Trans-Am-inspired Metallic Brown Kos Krusier: <a href="http://bmxmuseum.com/bikes/mongoose/57223">http://bmxmuseum.com/bikes/mongoose/57223<br /> </a>Pre-production “Raw” Kos Kruiser: <a href="http://bmxmuseum.com/bikes/mongoose/71436">http://bmxmuseum.com/bikes/mongoose/71436</a></p><p class="MsoNormal">Kid Kruiser: <a href="http://bmxmuseum.com/bikes/mongoose/70124">http://bmxmuseum.com/bikes/mongoose/70124</a></p><p class="MsoNormal"> </p><style><p class="MsoNormal">Six months ago I decided several things.</p><p class="MsoNormal"> </p><p class="MsoNormal">1. Tandem's serve a great function, but they do have some drawbacks. In my case, the first drawback was that most of them don't fit kids. Second was that I didn't want a road bike tandem, mountain bike tandem, beach cruiser tandem, or any other kind of tandem I'd ever seen other than the 1980's Kos tandem and the Metal Bikes tandem that Odyssey and Jimmy Levan built for InterBike a few years back.</p><p class="MsoNormal"> </p><p class="MsoNormal">2. Those two were what I wanted. This decision had a couple of problems associated with it, namely that the likelihood of my getting either one was slim-to-none and even if I did, it still wouldn’t solve the dilemma of kids not being able to ride it.</p><p class="MsoNormal"> </p><p class="MsoNormal">3. Next I decided that with over 30,000 members on BMX Museum, even if only 1-percent of those folks have kids that they want to ride with but aren’t always able to based on factors like destination, route, distance, etc., there’s at least 150 people here who’ve had the same thoughts as me.</p><p class="MsoNormal"> </p><p class="MsoNormal">4. Those 150 people would have an appreciation for, and possible desire to purchase, a tandem that checked the right boxes.</p><p class="MsoNormal"> </p><p class="MsoNormal">5. If the emotional connection to bikes that allow us to remember our youth is enough to get folks to cough up nearly 2 Grand for a pair of cranks that some factory guys couldn’t be paid to ride, and sharing that connection with your kids creates a stronger family bond, then building this bike is not insane.</p><p class="MsoNormal"> </p><p class="MsoNormal">You on the other hand, may just have a hot girlfriend who doesn’t know how to ride a bike. Either way, this bike had to be built.</p><p class="MsoNormal"> </p><p class="MsoNormal">Since these photos were taken a couple things have been tweaked. There is no longer chimney flashing and duct tape acting as a shim for the rear seat post clamp, the rear bars are higher, the seats are now color matched… That’s about it. Wheels are still mismatched, rear cranks are still too long for a 6-year old, but I can honestly say I have a good excuse: The amount of fun my son has had riding this with me has taken all priority off the details of getting it perfectly dialed because time spent working is time not spent riding.</p><p class="MsoNormal"> </p><p class="MsoNormal">In case you’re staring at the bizarre drivetrain, I can explain. The empty BB shell is made to fit an eccentric BB, however it still needs to be machined for the eccentric assembly to fit in. Once installed, the eccentric will allow a standard tandem drivetrain set-up to be used with the eccentric creating chain tension between the fixed points. There will be an additional chain linking the upper and rear cranks. For now, the freakish set-up you see here is getting it done.</p><p class="MsoNormal"> </p><p class="MsoNormal">Here’s a list of answers to questions I know will be asked:</p><p class="MsoNormal">Q: Are you insane?</p><p class="MsoNormal">A: Aren’t we all?</p><p class="MsoNormal"> </p><p class="MsoNormal">Q: Do you work for Mongoose?</p><p class="MsoNormal">A: Maybe. If you want one for free, then no, I don’t.</p><p class="MsoNormal"> </p><p class="MsoNormal">Q: Will this be a production bike?</p><p class="MsoNormal">A: Unlikely as of now. If so it would be in very limited numbers.</p><p class="MsoNormal"> </p><p class="MsoNormal">Q: Are you insane?</p><p class="MsoNormal">A: Me? Didn’t you just ask me that like 20 seconds ago?</p><p class="MsoNormal"> </p><p class="MsoNormal">Q: Can you build me one?</p><p class="MsoNormal">A: Maybe. Go find 50 of your closest pals who are willing to buy it 6+ months in advance of production. Do it now.</p><p class="MsoNormal"> </p><p class="MsoNormal">Q: How much would it cost?</p><p class="MsoNormal">A: Probably more than a cherry set of full-wrap single-pinch Flights, and less than a pair of NOS magnesium Motomags.</p><p class="MsoNormal"> </p><p class="MsoNormal">Q: What age range is the rear designed to fit?</p><p class="MsoNormal">A: From your 5-year old to his Great-Grandma.</p><p class="MsoNormal"> </p><p class="MsoNormal">Q: Are you insane?</p><p class="MsoNormal">A: Do you have a concussion or something?</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal">http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/e6a684c9.jpg</p><p class="MsoNormal">http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/6a3022b0.jpg</p><p class="MsoNormal">http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/1ff67d79.jpg</p><p class="MsoNormal"> </p> </body> </html>    </b>

http://bmxmuseum.com/img/view-bike-in-museum.gif

Last edited by bmxmarty (2017-09-16 11:21am)

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#2 2011-11-21 9:50am

norcalshan
Pro MemberPico Sanchez
From: California
Registered: 2010-06-17
Posts: 1412

Re: 2012 Mongoose Kos Kruiser Tandem 26

Well Done !!!


I really have BMX bikes....I swear....

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#3 2011-11-21 9:55am

Axel10
Pro MemberBMX Archaeologist
From: In Canada on Treaty 7 Land
Registered: 2011-03-25
Posts: 10102
For Sale: 1

Re: 2012 Mongoose Kos Kruiser Tandem 26

Congratulations on a beautiful ride. Hope the best of memories for you and yours riding that beauty smile


'El Derecho de Vivir en Paz'

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#4 2011-11-21 10:50am

oldbuzzard
Pro MemberTHE CRUISER KING
From: peoples republic of seattle
Registered: 2009-02-16
Posts: 1076
Bikes: 31

Re: 2012 Mongoose Kos Kruiser Tandem 26

Awesome ride cool

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#5 2011-11-21 3:56pm

Dubnali
Expert
From: San Jose, CA
Registered: 2011-07-10
Posts: 891
Bikes: 6

Re: 2012 Mongoose Kos Kruiser Tandem 26

cool Sweet ride!!! big_smile

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#6 2011-11-21 3:59pm

Mattman215
Pro Member"The Grey Goose"
From: Chicopee, MA
Registered: 2010-07-12
Posts: 1082
Bikes: 4

Re: 2012 Mongoose Kos Kruiser Tandem 26

Sick Build. Love the color, Needs a set of old school looking pads.

A+!


What I'd give for a early 80's 26" GT Cruiser....

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#7 2011-11-21 4:28pm

skinsfan
Pro Member
From: Folsom, CA
Registered: 2008-11-13
Posts: 823
Bikes: 7

Re: 2012 Mongoose Kos Kruiser Tandem 26

Wow, thats cool!!! big_smile

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#8 2011-11-21 11:36pm

its-all-good
Pro MemberDon't Cheers Me Bro
From: Portland Oregon
Registered: 2007-02-14
Posts: 33315
For Sale: 97
Website

Re: 2012 Mongoose Kos Kruiser Tandem 26

Crazy! But not insane. big_smile

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#9 2011-11-22 12:44am

551slander
***StateSider***
From: Chula Vista, CA
Registered: 2009-07-28
Posts: 1685

Re: 2012 Mongoose Kos Kruiser Tandem 26

cool


WTB: Survivor Hazard Yellow RL20II....Let's make a deal!!!!

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#10 2011-11-26 7:32am

no body
18yr old Frame-Wrecker
From: Florida
Registered: 2011-06-25
Posts: 3356
Bikes: 5

Re: 2012 Mongoose Kos Kruiser Tandem 26

that is the coolest kos i ever seen thats better than my dads kos big_smile


I AM 18 YEARS OLD!!! big_smile follow me on instagram @remington_schaefer

Ride in peace Autum Pasquale

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#11 2011-11-28 8:28pm

espbassist88
Intermediate
From: South Carolina
Registered: 2009-12-14
Posts: 298
Bikes: 26
Website

Re: 2012 Mongoose Kos Kruiser Tandem 26

Certainly different.


Bass Solo, Take One...

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#12 2011-12-01 10:43pm

zeekle
Pro Member
Registered: 2009-02-02
Posts: 397
Bikes: 5
Website

Re: 2012 Mongoose Kos Kruiser Tandem 26

The blank bottom bracket is for when the kiddo gets bigger - this is awesome! big_smile


WANT TO BUY:
zeronine gloves "Wrist-Wrap"
pm or email! cool

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#13 2011-12-06 6:38pm

bmxmarty
Pro Member
From: Hella NorCal
Registered: 2007-07-22
Posts: 200
Bikes: 48
For Sale: 35

Re: 2012 Mongoose Kos Kruiser Tandem 26

Here's a few more photos:

The lower rear bottom bracket was machined incorrectly, so the eccentric bottom bracket assembly doesn’t fit. As a result I had to get creative with the way the chains run since I can’t tension them as intended:
http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/Extra1_zps68aaa561.jpg

The frame has a sliding mount for the rear disc brake caliper to allow the brake to move fore and aft as the wheel is moved to tension the chain:
http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/Extra3_zps6c637ca7.jpg

Since the chain connecting the front and rear cranks isn’t running to the correct BB, which as mentioned takes the eccentric out of the equation, I had to use a cobbled together chain tensioner to keep things tight. Has worked surprisingly well so far, especially considering how sketchy the set-up is:
http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/Extra2_zpsa1570974.jpg

The beauty of a tandem is you can let your 6-year old do all the work:
http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/Extra4_zps95d5c75e.jpg

Tandem on a standard bike roof rack? No problem! It fits perfectly! Even at 6’-2” tall, getting it up and down was a pretty squirrelly proposition:
http://i624.photobucket.com/albums/tt327/bmxmarty/Rides/Extra5_zps38c0812e.jpg

Last edited by bmxmarty (2013-11-06 3:18pm)

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#14 2012-01-10 12:42pm

vegasangeles
Museum Newbie
Registered: 2010-12-13
Posts: 13
Bikes: 5

Re: 2012 Mongoose Kos Kruiser Tandem 26

******Genious*******

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#15 2012-01-10 11:29pm

Revs
Centurion Member
From: Sydney, Australia
Registered: 2009-01-15
Posts: 116
Bikes: 4

Re: 2012 Mongoose Kos Kruiser Tandem 26

That is AWESOME cool

Did this start off as a Kos cruiser or is it all custom ?  How many hours went into making this beast ?

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#16 2012-05-10 5:58pm

bmxmarty
Pro Member
From: Hella NorCal
Registered: 2007-07-22
Posts: 200
Bikes: 48
For Sale: 35

Re: 2012 Mongoose Kos Kruiser Tandem 26

Revs wrote:

That is AWESOME cool

Did this start off as a Kos cruiser or is it all custom ?  How many hours went into making this beast ?

This was built from the ground up as a tandem by the very same people that build the current Kos - No regular Kos Kruisers were harmed in the making of this bike big_smile . Quite a few hours, especially if you include the assembly, which as mentioned was a bit complex since the eccentric isn't yet functional so I was lost in a sea of chains for a while there lol .

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#17 2012-09-26 5:22pm

olnordicflyer
Expert
From: Umeå Sweden
Registered: 2010-10-07
Posts: 533
Bikes: 13
Website

Re: 2012 Mongoose Kos Kruiser Tandem 26

cool but "Are you insane" lollol

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#18 2013-01-31 4:45pm

Rmw4388
Centurion Member
Registered: 2012-01-17
Posts: 159
Bikes: 1

Re: 2012 Mongoose Kos Kruiser Tandem 26

I've never seen a bmx style tandem wow did u weld this ur self ?? It's awesome I'm nit much for mongoose but this here is a masterpiece haha wow it's awesome.

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#19 2013-01-31 5:44pm

tcmcdonald
Pro Member
From: Melbourne Village, FL
Registered: 2011-10-28
Posts: 201

Re: 2012 Mongoose Kos Kruiser Tandem 26

bmxmarty wrote:

Revs wrote:

That is AWESOME cool

Did this start off as a Kos cruiser or is it all custom ?  How many hours went into making this beast ?

This was built from the ground up as a tandem by the very same people that build the current Kos - No regular Kos Kruisers were harmed in the making of this bike big_smile . Quite a few hours, especially if you include the assembly, which as mentioned was a bit complex since the eccentric isn't yet functional so I was lost in a sea of chains for a while there lol .

Who are the people who build the current Kos? I had assumed it was made in a bike factory in Taiwan or China, along with other Mongoose bikes.

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#20 2013-02-07 8:44pm

Mongoose Two Nine
Museum Newbie
Registered: 2012-06-13
Posts: 16

Re: 2012 Mongoose Kos Kruiser Tandem 26

What a great idea for those who have purchased a Retro Kos, and regret it!
Are plans/dimensions available at all?
Cheers

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#21 2013-02-07 11:44pm

Mongoose Two Nine
Museum Newbie
Registered: 2012-06-13
Posts: 16

Re: 2012 Mongoose Kos Kruiser Tandem 26

I like it a lot! Clever build.
I don't have 50 close friends, but I'd wait 6 months and pay upfront, if that's the requirement. Even a F/F offer would be great.

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#22 2013-11-10 5:43am

Jayrev67
Pro Member
From: Pittsburgh, PA
Registered: 2013-08-06
Posts: 509
Bikes: 116
Website

Re: 2012 Mongoose Kos Kruiser Tandem 26

HURRAY!!! A visceral example of how to connect your son with the love you have for BMX while doing what you do best. You are a great builder and a great dad.


Stay Strong-Ride BMX   |   bikewhistle.com  | whistlebikes on ebay

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#23 2014-06-09 10:00am

iLoveMasters
Member
From: Troy NY
Registered: 2011-04-06
Posts: 89
Bikes: 3

Re: 2012 Mongoose Kos Kruiser Tandem 26

love it , coolest thing i seen in a while , but arn't you worried about falling back into that huge anal splitting brace .... i mean chances of it happening are so slim , but we've all hit the middle bar....i cringe at the back bar.....

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