Bottom bracket length for a Yo Eddy with XTR M900

Rick Draper · October 12th, 2012, 10:19 AM

Can anyone tell me what length of bottom bracket I need for a 1991 Yo Eddy with a press fit bottom bracket and a Topline chainset? At the moment its got a 122.5mm axle and I am sure its not long enough.

colker · October 12th, 2012, 11:38 AM

Quote:

Originally Posted by Rick Draper

Can anyone tell me what length of bottom bracket I need for a 1991 Yo Eddy with a press fit bottom bracket and a XTR M900 chainset? At the moment its got a 122.5mm axle and I am sure its to long.

If no one comes up w/ more experience.. 107mm.

tvcreative · October 12th, 2012, 12:38 PM

believe it or not I think the 120ish area is right

chainline · October 12th, 2012, 1:38 PM

For the m 900 xtr crank 107/113 should be right in the ball park. Although Im not sure you will find one in those lengths if your 91 Yo has a press fit BB ? Good luck !

yo-Nate-y · October 12th, 2012, 3:53 PM

The 120-122 side of things is good for XT m730 series and that era XC Pro, but I'll chime with the others that XTR should need 107-113mm.

Rick Draper · October 12th, 2012, 5:29 PM

Thanks for the answers. I found the advised BB lengths on mombat. Sadly I need a 107mm axle and with the collars thats just not workable.

Hence I have decided to try to find some Toplines or some Cook Bros RSR's. Shame really as the XTR's I have are really nice, O well.

Rick Draper · October 24th, 2012, 7:24 AM

Right got some Toplines now, what length of BB axle do I need?

chainline · October 24th, 2012, 9:05 AM

120/122 will work just fine..

Rick Draper · October 24th, 2012, 1:02 PM

Definitely needs a 127.5mm. Can anyone help me?

yo-Nate-y · October 24th, 2012, 2:10 PM

The arms are hitting the stays?

Rick Draper · October 24th, 2012, 3:10 PM

Quote:

Originally Posted by yo-Nate-y

The arms are hitting the stays?

Yep so it definitely needs a 127.5

chainline · October 24th, 2012, 3:56 PM

Wow.Real quick question. hows the fit of the crank taper on the crank ? 127.5 seems crazy long.

Rick Draper · October 24th, 2012, 5:31 PM

Quote:

Originally Posted by chainline

Wow.Real quick question. hows the fit of the crank taper on the crank ? 127.5 seems crazy long.

Cranks fit on the tapers nice, the graftons I have are spot on on a 122mm spindle. I will get a snap tomorrow now.

tvcreative · October 24th, 2012, 7:33 PM

BOTH arms are hitting the stays? that seems really long? are sure its properly centered? you should have about 4mm clearance both sides from my experience

Rick Draper · October 25th, 2012, 6:41 AM

Sorry for the rubbish pics but I could not be bothered removing it from the stand. As you can see I was wrong they dont hit the chainstay but they are very close, a bit to close for comfort I thought (I can see the axle is very slightly off centre):

chainline · October 25th, 2012, 9:20 AM

With the crank torqued to 35 ft lbs remove the bolt and tae a pic of the end of the spindle. from the end of the spindle to the bed of the washer you should have a few mm. If not. the taper on the crank arm is worn out.

chainline · October 25th, 2012, 9:30 AM

should look like this

Rick Draper · October 25th, 2012, 5:24 PM

I did find this while looking:
http://www.bikepro.com/products/bott...omptable.shtml
As shown it says Topline need a 127.5mm bb. This works out as the chainrings are roughly 2mm or so out from where they were on the graftons and thats what its about really, the chainline and not where the crank arms are in relation to the chainstay.

yo-Nate-y · October 25th, 2012, 5:46 PM

I have the sneaking suspicion it'll be easier to find a pair of Graftons or Cooks than a 127.5mm spindle.

colker · October 25th, 2012, 5:51 PM

That's when you think "i so want to thread this bb shell.."

chainline · October 25th, 2012, 6:20 PM

That's good. It would be a real shame to have a set of cranks like that,that had a bad taper.
Good find on the link..that will save a lot of time for peeps. I would work around what you have For spindle length.. Have fun cause that's what it's really about right? Cheers.

Rick Draper · October 26th, 2012, 2:33 AM

Quote:

Originally Posted by yo-Nate-y

I have the sneaking suspicion it'll be easier to find a pair of Graftons or Cooks than a 127.5mm spindle.

I did wonder if the phil wood ones could be machined down to suit? I have a set of graftons that are fine on it, I just fancied the Toplines.

If only Rody still did stuff or someone from the axle group buy had one for sale.

October 12th, 2012, 10:19 AM	#1
Rick Draper Member Join Date: June 13th, 2011 Location: Macclesfield Posts: 58	Bottom bracket length for a Yo Eddy Toplines Can anyone tell me what length of bottom bracket I need for a 1991 Yo Eddy with a press fit bottom bracket and a Topline chainset? At the moment its got a 122.5mm axle and I am sure its not long enough. Last edited by Rick Draper; October 24th, 2012 at 7:24 AM.

October 12th, 2012, 3:53 PM	#5
yo-Nate-y Global Moderator Join Date: March 12th, 2009 Location: Tucson Posts: 807	The 120-122 side of things is good for XT m730 series and that era XC Pro, but I'll chime with the others that XTR should need 107-113mm. __________________ 1975 Witcomb USA, 1981 Chris Chance; 1984 Fat Chance, 1987 Team Comp, 1991 Yo Eddy, Monster Fat, and Wicked ....happy to have finally found a clean 80s Fat Team Comp with a box crown fork

October 24th, 2012, 2:10 PM	#10
yo-Nate-y Global Moderator Join Date: March 12th, 2009 Location: Tucson Posts: 807	The arms are hitting the stays? __________________ 1975 Witcomb USA, 1981 Chris Chance; 1984 Fat Chance, 1987 Team Comp, 1991 Yo Eddy, Monster Fat, and Wicked ....happy to have finally found a clean 80s Fat Team Comp with a box crown fork

October 25th, 2012, 5:46 PM	#19
yo-Nate-y Global Moderator Join Date: March 12th, 2009 Location: Tucson Posts: 807	I have the sneaking suspicion it'll be easier to find a pair of Graftons or Cooks than a 127.5mm spindle. __________________ 1975 Witcomb USA, 1981 Chris Chance; 1984 Fat Chance, 1987 Team Comp, 1991 Yo Eddy, Monster Fat, and Wicked ....happy to have finally found a clean 80s Fat Team Comp with a box crown fork

October 25th, 2012, 5:51 PM	#20
colker Senior Member Join Date: June 1st, 2006 Location: rio de janeiro Posts: 1,013	That's when you think "i so want to thread this bb shell.." __________________ wanted: ride time.

October 12th, 2012, 12:38 PM	#3
tvcreative Senior Member Join Date: March 15th, 2010 Location: Naperville IL Posts: 716	believe it or not I think the 120ish area is right

October 12th, 2012, 1:38 PM	#4
chainline Senior Member Join Date: February 12th, 2010 Location: laconia Posts: 301	For the m 900 xtr crank 107/113 should be right in the ball park. Although Im not sure you will find one in those lengths if your 91 Yo has a press fit BB ? Good luck !

October 12th, 2012, 5:29 PM	#6
Rick Draper Member Join Date: June 13th, 2011 Location: Macclesfield Posts: 58	Thanks for the answers. I found the advised BB lengths on mombat. Sadly I need a 107mm axle and with the collars thats just not workable. Hence I have decided to try to find some Toplines or some Cook Bros RSR's. Shame really as the XTR's I have are really nice, O well.

October 24th, 2012, 7:24 AM	#7
Rick Draper Member Join Date: June 13th, 2011 Location: Macclesfield Posts: 58	Right got some Toplines now, what length of BB axle do I need?

October 24th, 2012, 9:05 AM	#8
chainline Senior Member Join Date: February 12th, 2010 Location: laconia Posts: 301	120/122 will work just fine..

October 24th, 2012, 1:02 PM	#9
Rick Draper Member Join Date: June 13th, 2011 Location: Macclesfield Posts: 58	Definitely needs a 127.5mm. Can anyone help me?

October 24th, 2012, 3:56 PM	#12
chainline Senior Member Join Date: February 12th, 2010 Location: laconia Posts: 301	Wow.Real quick question. hows the fit of the crank taper on the crank ? 127.5 seems crazy long.

October 24th, 2012, 7:33 PM	#14
tvcreative Senior Member Join Date: March 15th, 2010 Location: Naperville IL Posts: 716	BOTH arms are hitting the stays? that seems really long? are sure its properly centered? you should have about 4mm clearance both sides from my experience

October 25th, 2012, 6:41 AM	#15
Rick Draper Member Join Date: June 13th, 2011 Location: Macclesfield Posts: 58	Sorry for the rubbish pics but I could not be bothered removing it from the stand. As you can see I was wrong they dont hit the chainstay but they are very close, a bit to close for comfort I thought (I can see the axle is very slightly off centre):

October 25th, 2012, 9:20 AM	#16
chainline Senior Member Join Date: February 12th, 2010 Location: laconia Posts: 301	With the crank torqued to 35 ft lbs remove the bolt and tae a pic of the end of the spindle. from the end of the spindle to the bed of the washer you should have a few mm. If not. the taper on the crank arm is worn out.

October 25th, 2012, 5:24 PM	#18
Rick Draper Member Join Date: June 13th, 2011 Location: Macclesfield Posts: 58	I did find this while looking: http://www.bikepro.com/products/bott...omptable.shtml As shown it says Topline need a 127.5mm bb. This works out as the chainrings are roughly 2mm or so out from where they were on the graftons and thats what its about really, the chainline and not where the crank arms are in relation to the chainstay.

October 25th, 2012, 6:20 PM	#21
chainline Senior Member Join Date: February 12th, 2010 Location: laconia Posts: 301	That's good. It would be a real shame to have a set of cranks like that,that had a bad taper. Good find on the link..that will save a lot of time for peeps. I would work around what you have For spindle length.. Have fun cause that's what it's really about right? Cheers.

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