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Old 07-11-14, 05:23 PM   #1
1soggywaffle
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raleigh sovereign fixed gear/single speed

I recently picked up a Raleigh Sovereign that I am wanting to make into a single speed bike.

I was just wondering if any one has a recommendation of what sized bottom bracket to use for it.

I know it's 68 mm. I just need to know what length would be good.

If this is in the wrong section please feel free to move it

Thanks.
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Old 07-11-14, 08:20 PM   #2
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The specific crank you choose will determine the spindle length you need.
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Old 07-12-14, 12:17 PM   #3
1soggywaffle
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Originally Posted by JohnDThompson View Post
The specific crank you choose will determine the spindle length you need.
That's what I am trying to figure out what spindle length I need to get and was just wondering if anyone had any suggestions on where to start. I've checked out Sheldon brown and didn't really gather much from there.
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Old 07-12-14, 12:23 PM   #4
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First, choose the crank. Then we can help determine the proper bottom bracket.
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Old 07-12-14, 08:01 PM   #5
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And since your converting to a Single Speed, You'll want a proper chainline so you can almost toss "recommended spindle lengths" out the window.

The best option (IMHO) is to build the bike minus the BB. Than with bike and crank in hand visit a shop/co-op with a large supply of brackets and begin the processes of finding that perfect line.
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Old 07-12-14, 08:23 PM   #6
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Listen to Velognome, that is the best way to proceed, otherwise you stand to guess wrong and then you're stuck with spare parts. If you're looking for a magic number there isn't one. I've built a number of bikes for people in the same manner as you, it'll likely be between 68x103 and 68x109 but the layback on every crank is different... especially if you're recycling a road crank with multiple chainrings vs. a true track crank. The possibilities are endless, good luck!

Peace,

-D-
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