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Old 04-17-11, 09:48 PM   #1
sprocket47
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spindle length

I'm building an early 90's cannondale road frame to single speed and I'm ordering the parts online. How long do I need for my square taper spindle for proper chain alignment? Ordering online I would prefer to get it right the first time so I can avoid returns. I'll be using a flip-flop ss wheel set w/120 spacing. The bb is 68mm, if that maters. The options on the bb's I'm looking at are 107, 110 or 115mm.

The frame is bare so I can't do any meassuring of current chain line or spacing from a current crank.
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Old 04-18-11, 07:37 AM   #2
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The spindle length will be determined by the crank you choose, not by the frame. When you pick the crank, it should come with a recommended spindle length.
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Old 04-18-11, 08:00 AM   #3
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As Hillrider says, the crank determines the spindle. Where the crank specifies a range, you want to go toward the shorter end for better chainline with your 120mm single speed setup.
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Old 04-18-11, 10:44 AM   #4
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Originally Posted by FBinNY View Post
As Hillrider says, the crank determines the spindle. Where the crank specifies a range, you want to go toward the shorter end for better chainline with your 120mm single speed setup.
The hub the OP is getting may be 120 mm but I'll bet the frame is either 126, 130 or maybe 128. He said it's an early '90's Cannondale road frame so the chances of it being 120 mm are about nil.
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Old 04-18-11, 01:38 PM   #5
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The rear axle span actually meassures out as ~125 but I haven't seen a ss or track wheelset with 125 spacing. Do I go with 120 and "squeeze" it? Or work harder to find an actual 125, 126, 128 wheel?
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Old 04-18-11, 08:20 PM   #6
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The standard 6/7-speed rear frame spacing is 126 mm and in the early '90's it was a common width. You could squeeze a 120 mm hub into the frame by tightening the axle nuts or qr but it's not a very convenient method and permanantly "cold setting" (read bending) an aluminum frame is not recommended.

You could respace your single speed 120 mm hub to 126 mm by adding a 6 mm spacer to the non-drive side, recentering the axle and redishing the rim. If the axle protrusion with the standard axle length (131 mm) isn't adequate you could substitute a 137 mm axle.
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