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Profile 3pc Install Guide

#1 2010-03-14 12:32pm

boxline69
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Profile 3pc Install Guide

Bored so I scanned this.

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/6990/profile1-15ac4595c44.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/6990/profile2-15ac4597b33.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/6990/profile3-15ac4598b6c.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/6990/profile45ac45999b2.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/6990/profile55ac459a976.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/6990/profile5a5ac459b678.jpg


Someone say Sticky wink

Last edited by boxline69 (2010-03-14 12:39pm)


You Can't Fix Stupid
Need VDC Changa Fork!! and Monkey Bars!!

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#2 2010-03-14 6:14pm

itsdug
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Re: Profile 3pc Install Guide

Nice. Add it to the reference section too. http://bmxmuseum.com/forums/viewtopic.php?id=14699

Last edited by itsdug (2010-03-14 6:16pm)


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#3 2010-03-14 6:51pm

boxline69
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Re: Profile 3pc Install Guide

itsdug wrote:

Nice. Add it to the reference section too. http://bmxmuseum.com/forums/viewtopic.php?id=14699

It's already a sticky at the top of the page. smile


You Can't Fix Stupid
Need VDC Changa Fork!! and Monkey Bars!!

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#4 2014-02-06 6:53pm

BDUBinVegas
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Re: Profile 3pc Install Guide

Alright, the cranks arrived in the mail today so next question.  How snuggly should the sprocket adapter fit into the sprocket?   The cranks came with what looks like two adapters, or at least two pieces that could slide together into the opening in the sprocket.  The  problem is that if I try to use both it won't fit (at least not with out introducing a hammer to the equation).  If I use only one it doesn't fit snug and will spin freely without turning the sprocket.  Mind you I have not assembled it in the bike yet and the sprocket is not screwed to the crank arm. 

By the way, it is a Profile sprocket.

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#5 2015-05-04 4:55pm

HuffyShredder
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Re: Profile 3pc Install Guide

brindle wrote:

I never knew about the gap in the frame and cup thing cool

Yea, this is the most important part... do not leave the sleeve out or modify it in any way.  Keeping all the wheel bolt pressure along the bearing axle race is what gives this system a benefit.  All the rider weight remains in a vertical orientation, thus reducing friction by keeping things lined up physically the way they should...

From my post on this thread, and why sealed is better and the sleeve is verrry important:
http://bmxmuseum.com/forums/viewtopic.php?id=643479
The pressure in a loose ball setup is at a diagonal angle, which means the pressure is not the same.  I am not sure if the physics are the same, but when setting up the anchors ( V shape), anything around 60* I 60* I 60* gives 100% of the load on each rope (I).  When you go 45* I 90* I 45* the load on each rope is over 100% of the original load.  Ideal is around 75* I 30* I 75*  or less for the V of the anchors.  It seems illogical that this could be, but that is how physics works.  This should relate directly to bearings, so a load on the bearing in a diagonal from the cup to the race at near 45% could mean that each side of the bearing is taking the 100%-150% of the weight load.  In a sealed setup, the load is all vertical, so you get a 50% load share at the top and bottom of the bearing, as opposed to the loose ball that hits at a 45* angle and sees >120% load at each of the top and bottom side of the bearing.  The force would be here - *O.  where the asterix and period are, having 120% of force at each, as opposed to
*
O
*
with sealed bearings having 50% force at each.


I destroyed my Murray and Huffy bikes as a kid in the 80s while my friends rode nice bikes..  Shitty gear can cause injury and hurt your children. Hurting your children is child abuse...  Don't abuse your children!
09 Haro Team Issue XL 38I,  95 Mongoose Expert Pro 38W, 15 RL Flight Jr. 8I, 17 USA BMX Strider 3B, and maybe a few others...

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#6 2015-12-13 11:42am

Cru Jumper Jones
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Re: Profile 3pc Install Guide

I'm gonna be installing 3rd gen Profile cranks to a Hutch Pro Racer frame (serial 123). I measured the BB shell at 66 mm (2-5/8"). The instructions here says that needs the gold tube spacer. I have a silver one. Do I really need the gold one?

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#7 2017-02-12 6:11pm

HawkF20L
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Re: Profile 3pc Install Guide

i also never knew about that cup gap...weird. ill try and install mine like this...not sure if i have the right spacer or not...this is reffering to the long spacer that goes inside the BB, right? not the small washers that go on the outside...?

i bought a new ano blue hop-up kit with the swanky cone spacers, should look SWEET on the fresh white poweder coat on my frame! just want to install it right!

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#8 2017-02-12 6:16pm

troynlori
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Re: Profile 3pc Install Guide

yes the internal spacer sleeve....you have to cut it to the right length so that you get the small gap.


Hi.

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#9 2017-02-12 6:44pm

NormNorth76
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Re: Profile 3pc Install Guide

troynlori wrote:

yes the internal spacer sleeve....you have to cut it to the right length so that you get the small gap.

Are these available anywhere?

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#10 2017-02-12 6:46pm

troynlori
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Re: Profile 3pc Install Guide

Yeah, sure, but you can get it off the profile website.


Hi.

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#11 2017-02-13 9:36am

HawkF20L
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Re: Profile 3pc Install Guide

all these years and ive never noticed a gap on any left side. i feel like its something i would have noticed along the way, at some point..

does anyone have a pic of this correct gap?

basically, on the left side, the internal spacer only lets the cup seat so far, creating this gap?

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#12 2017-08-28 6:43am

HuffyShredder
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Re: Profile 3pc Install Guide

HawkF20L wrote:

all these years and ive never noticed a gap on any left side. i feel like its something i would have noticed along the way, at some point..

does anyone have a pic of this correct gap?

basically, on the left side, the internal spacer only lets the cup seat so far, creating this gap?

Hawk,

The gap should be really minimal - all you should get is a slight paper width gap between the cartridge bearing cup and the 'Murican bottom bracket shell.  You might notice and think the bearing isn't pressed all the way in, thus using your press more; instead, realize the inner sleeve is making contact with the inside of each bearing and the whole system is pressed as far as possible. 

When you remove your press, the sleeve should be a little difficult to move around.  When you put the spindle in and crank arms on, the tensioning pressure of the arms to outside spacers to bearings to inner sleeve creates a single system, allowing the forces on the bearing to operate as designed - vertically.


I destroyed my Murray and Huffy bikes as a kid in the 80s while my friends rode nice bikes..  Shitty gear can cause injury and hurt your children. Hurting your children is child abuse...  Don't abuse your children!
09 Haro Team Issue XL 38I,  95 Mongoose Expert Pro 38W, 15 RL Flight Jr. 8I, 17 USA BMX Strider 3B, and maybe a few others...

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