Retrobike Forum Index

It is currently Sat Jun 23, 2018 4:21 am

* Login   * Register * Search  * FAQ

Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Wed Jul 10, 2013 7:03 pm 
Old School Grand Master
User avatar

Joined: Fri May 01, 2009 7:11 pm
Posts: 8536
Location: Go ask Alice...
What length BB do they take?

PostPosted: Wed Jul 10, 2013 9:49 pm 
Retro Guru
User avatar

Joined: Sat Jun 21, 2008 11:41 am
Posts: 250
Location: New Zealand ... 89867.html

113 x68 seems to be the go

PostPosted: Thu Jul 11, 2013 11:25 pm 
98+ BoTM Winner / Gold Trader
98+ BoTM Winner / Gold Trader
User avatar

Joined: Wed Aug 15, 2007 7:29 pm
Posts: 1657
Location: Netherlands
113x68 did not work for me. Bigger front rings and wide chainstay frames need longer axles to clear, and sometimes quite a bit longer. WI have an instruction on the site that relates the length of your BB axle to the size of the chainring and the width of the frame. And beware, be sure you have the wider Q-factor Mountain ENO's, the road ones are narrow and hence need very long BB axles.

Enjoy!! ... _GUIDE.pdf

1. These calculations are based on using a 113mm, symmetrical, JIS, square taper, White
Industries bottom bracket which yields a 47.5mm chain line. This is measured from the center-line of
the seat tube to the center-line of the chain ring. To determine whether there will be suitable clearance
between the chain ring and the chain stay, you must determine which chain ring you intend to use. For
example, choose a 44t chain ring and note that the radius of a 44t chain ring is 92mm. Measure from
the center of the bottom bracket back along the length of the drive side chain stay 92mm and mark that
point on the outside of the chain stay (you can use a piece of masking tape). Next, measure across to
the same point on the non-drive side chain stay and record the width of the chain stays, outside to
outside. If your measurement is 85mm* or less, you can safely run a 44t chain ring on your frame, using
our ENO crank set and a 113mm bottom bracket. If your measurement is over 85mm, say 90mm for
example, double the 5mm difference, add it to 113 and you need a 123mm long bottom bracket to
provide adequate clearance between the chain ring and chain stay.
*Maximumchain stay width (outside to outside) at a given radius = 85mm
44t = 92mmradius
42t = 88mmradius
38t = 80mmradius
36t = 76mmradius
34t = 72mmradius
32t = 67mmradius

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC [ DST ]

Who is online

Users browsing this forum: No registered users and 11 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group