BB sizing when 2 lengths spec'd?
01-02-07, 05:27 PM
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BB sizing when 2 lengths spec'd?
I'm looking at the Sugino XD600 for my wife's bike, and it lists 113/118 for spindle lengths. How do I know which I need?
Here's the relevant info (do you need any other info?):
early 1990s Giant Innova hybrid
7sp, 135mm rear hub
Tubing is not oversized
Here's the relevant info (do you need any other info?):
early 1990s Giant Innova hybrid
7sp, 135mm rear hub
Tubing is not oversized
01-02-07, 06:04 PM
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I believe the 113 is spec'ed for a 1-1/8" diameter seat tube (older steel frames) and the 118 mm is spec'ed for 1-1/4" and 1-3/8" diameter seat tubes (almost all Al and Ti and many newer steel frames).
The longer spindle is needed to get the crank far enough from the seat tube that the front derailleur can reach to small chainring before it hits the seat tube. This is a particular problem with triple cranks.
The longer spindle is needed to get the crank far enough from the seat tube that the front derailleur can reach to small chainring before it hits the seat tube. This is a particular problem with triple cranks.
01-02-07, 07:08 PM
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As others have indicated, the longer spindle length is typically for bikes for larger tubing which will move the front dérailleur outboard.
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
01-02-07, 08:01 PM
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Originally Posted by HillRider
I believe the 113 is spec'ed for a 1-1/8" diameter seat tube (older steel frames) and the 118 mm is spec'ed for 1-1/4" and 1-3/8" diameter seat tubes (almost all Al and Ti and many newer steel frames).
The longer spindle is needed to get the crank far enough from the seat tube that the front derailleur can reach to small chainring before it hits the seat tube. This is a particular problem with triple cranks.
The longer spindle is needed to get the crank far enough from the seat tube that the front derailleur can reach to small chainring before it hits the seat tube. This is a particular problem with triple cranks.
01-02-07, 08:07 PM
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Originally Posted by Retro Grouch
I've heard a different story that makes sense to me: The different spindle lengths correspond to the rear dropout spacing 130 vs 135. Using the wider spindle length with 135 dropouts corrects the chainline.
