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Old October 12th, 2012, 10:19 AM   #1
Rick Draper
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Default 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.
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Old October 12th, 2012, 11:38 AM   #2
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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.
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Old October 12th, 2012, 12:38 PM   #3
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believe it or not I think the 120ish area is right
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Old October 12th, 2012, 1:38 PM   #4
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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 !
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Old October 12th, 2012, 3:53 PM   #5
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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.
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Old October 12th, 2012, 5:29 PM   #6
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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.
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Old October 24th, 2012, 7:24 AM   #7
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Right got some Toplines now, what length of BB axle do I need?
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Old October 24th, 2012, 9:05 AM   #8
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120/122 will work just fine..
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Old October 24th, 2012, 1:02 PM   #9
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Definitely needs a 127.5mm. Can anyone help me?
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Old October 24th, 2012, 2:10 PM   #10
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The arms are hitting the stays?
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Old October 24th, 2012, 3:10 PM   #11
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The arms are hitting the stays?
Yep so it definitely needs a 127.5
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Old October 24th, 2012, 3:56 PM   #12
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Wow.Real quick question. hows the fit of the crank taper on the crank ? 127.5 seems crazy long.
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Old October 24th, 2012, 5:31 PM   #13
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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.
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Old October 24th, 2012, 7:33 PM   #14
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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
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Old October 25th, 2012, 6:41 AM   #15
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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):

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Old October 25th, 2012, 9:20 AM   #16
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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.
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Old October 25th, 2012, 9:30 AM   #17
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should look like this
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Old October 25th, 2012, 5:24 PM   #18
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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.
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Old October 25th, 2012, 5:46 PM   #19
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I have the sneaking suspicion it'll be easier to find a pair of Graftons or Cooks than a 127.5mm spindle.
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Old October 25th, 2012, 5:51 PM   #20
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That's when you think "i so want to thread this bb shell.."
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Old October 25th, 2012, 6:20 PM   #21
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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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Old October 26th, 2012, 2:33 AM   #22
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Quote:
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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.
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