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PostPosted: Mon Aug 07, 2017 12:02 am 
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Joined: Sat May 09, 2009 1:52 pm
Posts: 464
Location: England, UK
Hi all

I'm building a new bike and for the first time using a SRAM groupset with Quarq DZero Red GXP cranks. The frame is a BMC RoadMachine 01 - PF86 Bottom Bracket shell.

I've gone and bought (and partly fitted) a Wheels MFG BB86/92 Shimano 24mm compatible threaded bottom bracket since PF is known to creak and this should solve that...

However I noticed (too late) that WheelsMFG make a specific SRAM version for 22/24mm systems.

When I use calipers to measure the DZero spindle it is 24mm so I can't see it will be a problem...but what am I missing? Why does the SRAM version exist?

TIA


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PostPosted: Mon Aug 07, 2017 12:11 am 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1867
Location: Welland, Ontario
You should have done a little more research. And looked at the crankset a little harder.

GXP spindles are 24 mm except at the NDS end where there is a shoulder and then they step down to 22 mm.

Therefore the NDS bearing on GXP is either:

1. smaller

or

2. has a sleeve that reduces it to 22 mm. (this was the early years of GXP)

You cannot use a regular Shimano BB.

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


Last edited by bikerjulio on Mon Aug 07, 2017 1:51 am, edited 2 times in total.

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Posted: Mon Aug 07, 2017 12:11 am 


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PostPosted: Mon Aug 07, 2017 12:41 am 
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Joined: Mon Feb 19, 2007 7:26 am
Posts: 2190
Location: Atlanta, GA, US
bikerjulio wrote:
You cannot use a regular Shimano BB.

+1. Return the other one if you can and get a SRAM specific one.

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PostPosted: Mon Aug 07, 2017 6:11 am 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 1349
Location: it's raining, it must be uk
as above, get the gxp

this is a gxp spindle, 24mm all the way except for the step at the end where is goes to 22mm...

Image


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PostPosted: Mon Aug 07, 2017 8:56 am 
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Joined: Sat May 09, 2009 1:52 pm
Posts: 464
Location: England, UK
Thank you. Will source the SRAM version.


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PostPosted: Tue Aug 08, 2017 1:44 am 
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Joined: Tue Jan 13, 2009 2:35 am
Posts: 767
There used to be a little sleeve you could buy to run GXP cranks in a Shimano BB. I've not actually ever seen one, but I have seen reference to it. It might be worth looking into if you've already pressed the BB into the frame. I'm pretty sure you can't return them after they've been pressed in.


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PostPosted: Tue Aug 08, 2017 9:26 am 
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Joined: Fri Aug 09, 2013 1:10 pm
Posts: 48
Something like this should do the trick: http://www.ebay.com/itm/J-L-BB-Bottom-B ... 1668785933

I think that Hope may do something along these lines as well.


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PostPosted: Tue Aug 08, 2017 1:40 pm 
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Location: Welland, Ontario
benhama wrote:
Something like this should do the trick: http://www.ebay.com/itm/J-L-BB-Bottom-B ... 1668785933

I think that Hope may do something along these lines as well.


The flanges on those look really thick - 2 mm at least. That means that the NDS spline engagement is less than designed, and the cranks is pushed 2 mm to the right.

The Hope is similar, but I don't think available any more.

FWIW the original sleeve was a tight press fit with no flanges - just a plain sleeve. But again that style is long gone.

I'd just get the right BB.

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


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PostPosted: Wed Sep 13, 2017 9:39 pm 
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Joined: Wed Dec 30, 2015 12:41 am
Posts: 269
So what do you guys think about Sram's own current version of BB86 to GXP Bottom bracket?
Does plastic press in sufficient for the task while not damaging the frame as much as a tight aluminum press in?

Would Wheels mfg thread together version, which is like "snug but can be push in by hand" right side and loose fit left side so we can turn it to thread both side together, fit better or worse than Sram's tight press fit on both side?

i wouldn't want to use aluminum tight fit press in right now so here are two approach i think make sense but don't know which one is better.


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PostPosted: Wed Sep 13, 2017 10:35 pm 
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Joined: Thu Mar 28, 2013 4:42 pm
Posts: 834
Location: Pa USA
Sram's is fine. If you've not installed a gxp crank its a little different, take a look at the instructions...the nds arm gets torqued really darn tight as it doesn't preload the bearing so much as clamp the step against the inner race. You need the appropriate seal and shims for it to work as intended. Its kind of counter intuitive.


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PostPosted: Wed Sep 13, 2017 11:04 pm 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1867
Location: Welland, Ontario
GXP and also Campy's UT were designed back in the days when bearing cups were screwed in and therefore provided a solid anchor to prevent lateral movement.

The GXP design locks the spindle to the NDS bearing. Therefore if the bearing is pressed in, the crank has a tendency to work it out.

As long as the bearing cups are nice and secure, all should be well. The screwed together solution is a little more solid IMO.

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


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Posted: Wed Sep 13, 2017 11:04 pm 


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PostPosted: Thu Sep 14, 2017 12:01 am 
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Joined: Thu Jul 19, 2012 6:09 pm
Posts: 1109
Location: Loveland, CO
A bit off topic but I'm getting a custom Ti frame built. I spoke to my frame builder today. I asked him if he has the tooling for the new T47 BB standard. He said yes. Without hesitation I told him I want T47

T47 is basically a threaded PF30. It has the same dimensions as a FP30 BB shell except it's threaded. I'm going to get a Chris King T47 BB. I also like Chris King's neat grease injector tool. I've have had some issues in the past with regards to water intrusion on both Praxis and Wheels Mfg BBs. The CK grease injection tool will solve that problem.


Sent from my iPhone using Tapatalk


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