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measure the BCD of your current chainring: http://www.sheldonbrown.com/gloss_bo-z.html and you're set.
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hey,
about to put a phil BB in my new build. the instructions supplied are a little ambiguous and don't have diagrams. i like diagrams. i remember stumbling across an illustrated guide to installing a phil BB somewhere on the internet. but for the life of me can no longer find it. anyone seen it, bookmarked it perchance?
cheers.
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started at 50x15 when i first started riding fixed. which was pretty stupid. dropped to 50x17 then 48x17 and now i run 47x17 which i'm pretty happy with. high enough they i don't get dusted be every second roadie. low enough that i can skid and tackle hills without too much grief.
i've been tempted to drop to 45x17 for some more spin.
i've always used single toshi straps when not riding clipless but am going to put clips and staps on my new build. for those of you who have used both single and doubles...is there any noticeable benefit to doubles?