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20" to 26" conversion. Mid School dyno build  RSS Feed

#26 2017-05-28 10:02am

GAry
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Re: 20" to 26" conversion. Mid School dyno build

Wow, I was skeptical at first, but it came out nice!!
Neat project!


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#27 2017-05-28 10:16am

Jesse96ss
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Re: 20" to 26" conversion. Mid School dyno build

GAry wrote:

Wow, I was skeptical at first, but it came out nice!!
Neat project!

Thanks! Sorry for having it in the wrong spot smile


#STANDWITHSCOTTY


Screw J&R bmx “superstore”

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#28 2017-05-28 10:39pm

Crashman
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Re: 20" to 26" conversion. Mid School dyno build

You didn't drop the bottom bracket, and now some moron is going to copy you without even considering the bottom bracket height. Again. Because the world is full of morons.


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#29 2017-05-28 10:42pm

Crashman
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Re: 20" to 26" conversion. Mid School dyno build

...and I'll be ridiculed by a moron who says "but it looks cool, this is a place of congratulation" when I think of it as a place for INFORMATION. People need to know these things before they jump into these projects, so they can plan ahead and decide for themselves whether they really want to do it right...or just make an art project.


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#30 2017-05-28 10:47pm

Crashman
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Re: 20" to 26" conversion. Mid School dyno build

Before I get drown out by the clapping seals and haters, I should probably sign this:

-Someone whose own 24" BMX conversion can't be ridden race-style unless I put 20" wheels on the bike.


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#31 2017-05-28 11:47pm

surferkain
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Re: 20" to 26" conversion. Mid School dyno build

Bur he did drop the bottom bracket. hmm


This is my bike, there are others like it but this one is mine.

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#32 2017-05-29 12:35am

Crashman
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Re: 20" to 26" conversion. Mid School dyno build

surferkain wrote:

Bur he did drop the bottom bracket. hmm

We must be looking at different images:
http://uploads.bmxmuseum.com/user-images/234558/img_2497592af8dfe7.jpg
I have a bike with a bottom bracket raised 2", it's "entertaining" to ride and might be OK for rock crawling, but it sucks for dirt track style riding or even doing tricks. His would be raised a hair more than 3" if he'd done no angular adjustment to the chain stays, and simply tilting the bottom bracket forward wouldn't work because of the angles of the seat and down tubes.


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#33 2017-05-29 5:18am

AlurencatBMX
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Re: 20" to 26" conversion. Mid School dyno build

Bitchin'. Totally bitchin' !!!! cool


If you haven't seen the magical stars floating around whilst lying face down in the mud you ain't lived.

Skyways for show, spokes for go.

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#34 2017-05-29 6:07am

Indyjps
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Re: 20" to 26" conversion. Mid School dyno build

Crashman,  I see what youre saying,  comparing axle ht to crank centerline on a Taj 26 (everyone who rides these loves them).   The crank is well below axle height. Chainstays angle down.
http://uploads.bmxmuseum.com/user-images/236303/bmx-26-inch-cruiser-2015-fairdale-taj-1592c1bf588.jpg

The dyno has the cranks high in comparison and Im guessing would feel like youre way up on the frame when riding.

The Taj frame geometry could have the seat tube shortened and top tube angled down for an overall shorter bike, as seen in a lot of the 26".  But the crank to axle height will effect ride feel.

Big Ripper has shorter seat tube, but similar crank centerline, below axle ht on a 26.
http://uploads.bmxmuseum.com/user-images/236303/107229592c1e5338.jpg

On a different note, I did the reverse, I chopped a 26 frame for a musclebike type build and didnt pay enough attention to this,  had to run a shorty crank 160mm or so to fix my lack of foresight.   I learned my lesson on that bike.  Looks cool but doesnt ride as well as it should.

Last edited by Indyjps (2017-05-29 6:20am)


MTNBKSUK

Location: Chicago Burbs

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#35 2017-05-29 7:02am

Jesse96ss
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Re: 20" to 26" conversion. Mid School dyno build

Honestly I don't care about the bottom bracket height. It's not for racing, it's not for doing tricks, it's not to please anyone.. especially you. It's built for my father to come riding with me. For you to go on a 3 post rant calling me a moron says a lot about you bud..people like you ruin the fun in building bmx bikes. And more importantly NO WHERE does this post give anyone a how to on building one.

Thanks everyone for kind words. When the frame/fork is back from paint I'll update the pictures. cool


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#36 2017-05-29 7:09am

Indyjps
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Re: 20" to 26" conversion. Mid School dyno build

Cant wait to see the colors,  you doing decals?  A custom dyno 26 decal would be cool.


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Location: Chicago Burbs

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#37 2017-05-29 7:17am

Jesse96ss
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Re: 20" to 26" conversion. Mid School dyno build

Indyjps wrote:

Cant wait to see the colors,  you doing decals?  A custom dyno 26 decal would be cool.

We have decided on white. Going to give it a 86 d-30 theme. The decals will be red and black. (Anyone make custom decals here?) The top tube will have something custom.. still up in the air though.  I have tires on the way and I have to build the wheels.


#STANDWITHSCOTTY


Screw J&R bmx “superstore”

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#38 2017-05-29 11:17am

luxeinternational
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Re: 20" to 26" conversion. Mid School dyno build

Nice.. I was hoping you would go with an old school theme too..

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#39 2017-05-29 11:35am

Crashman
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From: Mount Pleasant, MI
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Re: 20" to 26" conversion. Mid School dyno build

Hey, I'm not trying to actually insult anyone, I just want people to know about the bottom bracket issue before they jump into a mod like this. When a guy was setting one of these up last year, people who would argue geometry all day on new builder were saying geometry wasn't important in a conversion big_smile


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#40 2017-05-29 5:35pm

GT_Junkie
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Re: 20" to 26" conversion. Mid School dyno build

Looks cool

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#41 2017-05-30 6:30am

cobra_standard
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Re: 20" to 26" conversion. Mid School dyno build

I think it's a fair call, the BB height issue is definitely worth noting in conversion threads.
It's a cool creative project but it won't ride like a 26" cruiser with that geo.


Never argue with a fool; onlookers may not be able to tell the difference. —Mark Twain

Wanted to buy;
Phil spider
Mongoose KOS bars
Peregrine Mad Maxx 24" chrome rim

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#42 2017-05-30 9:27am

Coco
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From: Regina, Saskatchewan Canada
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Posts: 8488

Re: 20" to 26" conversion. Mid School dyno build

Holy cow that BB is high. Looks like I am not the first to mention that.

Cool project though, nonetheless.

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#43 2017-06-01 1:26pm

vwzx
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Registered: 2012-11-20
Posts: 529

Re: 20" to 26" conversion. Mid School dyno build

I like the half chrome half paint thing. You should keep it like that for a while. Maybe paint the bottom of the fork legs to match as best as you can and clear over the welds. Put on a new down tube decal and you're set. smile


83 Skyway TA
88 Free Agent cruiser
89 Auburn
92 PK Ripper

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#44 2017-06-03 9:50am

raulluis
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Re: 20" to 26" conversion. Mid School dyno build

HEY PEOPLE

that argument of the BB height is nonsense in this topic
WHY?
1- he is doing it in his garage
2- from an existing bike frame
3- he is just cutting tubes reinforcing it on the inside, matching the tube existing angles and welding them
4- just to fit 26" wheels
5- he is doing something for his relative
6- the most important, anything did for your family have more value and worth more than anything money can buy
7- in conclusion, anything with 2 wheels propelled by pedals is a BICYCLE !


If you can't stand behind our troops,then,feel free to stand in front of them.

My 1990 GT Aggressor build !!!
http://bmxmuseum.com/forums/viewtopic.php?id=560014

2015 Mid School Build OFF
http://bmxmuseum.com/forums/viewtopic.php?id=602923

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#45 2017-06-03 1:35pm

Crashman
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From: Mount Pleasant, MI
Registered: 2012-04-22
Posts: 5242
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Re: 20" to 26" conversion. Mid School dyno build

raulluis wrote:

HEY PEOPLE

that argument of the BB height is nonsense in this topic
WHY?
1- he is doing it in his garage
2- from an existing bike frame
3- he is just cutting tubes reinforcing it on the inside, matching the tube existing angles and welding them
4- just to fit 26" wheels
5- he is doing something for his relative
6- the most important, anything did for your family have more value and worth more than anything money can buy
7- in conclusion, anything with 2 wheels propelled by pedals is a BICYCLE !

But you're wrong, because projects like this need to come with the "I knew it would be a problem but I didn't care" warning. Otherwise, people who don't understand geometry DO and HAVE done this stuff expecting a better outcome, because duh they don't understand geometry (even the visual kind).


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#46 2017-06-03 2:14pm

Jesse96ss
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Re: 20" to 26" conversion. Mid School dyno build

roll here we go again....

Dude, we have read all your post. We all know you think I'm an idiot and I knew nothing about frame geometry...roll it's a BICYCLE!

I also have 2 mountain bike frames welded together. One on top of the other.. want to tell me that it's wrong to?

Please stop trolling my post...

Last edited by Jesse96ss (2017-06-03 2:14pm)


#STANDWITHSCOTTY


Screw J&R bmx “superstore”

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#47 2017-06-03 2:20pm

Crashman
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From: Mount Pleasant, MI
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Re: 20" to 26" conversion. Mid School dyno build

Jesse96ss wrote:

roll here we go again....

Dude, we have read all your post. We all know you think I'm an idiot and I knew nothing about frame geometry...roll it's a BICYCLE!

I also have 2 mountain bike frames welded together. One on top of the other.. want to tell me that it's wrong to?

Please stop trolling my post...

You're not going to race it or perform complex maneuvers big_smile Please quit trolling my legit responses :p


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#48 2017-06-03 3:05pm

cobra_standard
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Re: 20" to 26" conversion. Mid School dyno build

It's actually not nonsense the geometry/bb comment is a perfectly legitimate observation.  wink


Never argue with a fool; onlookers may not be able to tell the difference. —Mark Twain

Wanted to buy;
Phil spider
Mongoose KOS bars
Peregrine Mad Maxx 24" chrome rim

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#49 2017-06-03 4:46pm

Crashman
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From: Mount Pleasant, MI
Registered: 2012-04-22
Posts: 5242
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Re: 20" to 26" conversion. Mid School dyno build

cobra_standard wrote:

It's actually not nonsense the geometry/bb comment is a perfectly legitimate observation.  wink

The OP is an artist. My response was precautionary to other builders. The only trolling I saw came from raulluis smile


Wanted: Inexpensive lot of cheap 7/8" bars for grandkid's bikes. I will paint as needed.

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#50 2017-06-04 3:45pm

80sFreestyleFan
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Re: 20" to 26" conversion. Mid School dyno build

Look's cool lol So is it a high center of gravity or what? What's The big deal?


That chit will buff out

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