Difference between compact and standard drive?
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I've got 4 bolt chainrings in 28/38/48 so it's all stuff and nonsense.
More info ... http://www.sheldonbrown.com/gloss_bo-z.html#bcd
More info ... http://www.sheldonbrown.com/gloss_bo-z.html#bcd
standard drive have a 110 outer PCD and are 5 arm as far as i know
compact drive are 94 outer PCD and can be either 4 or 5 arm
generally the smaller PCD the smaller size rings you can run, hence old cranks running 26-36-48 and newer ones having 24-34-44 or similar, although just to confuse this Suntour microdive had a 20/22t inner (i think)
standard drive also tended to run a 12t at the back, with compact running an 11t (although BITD TNT made a lock ring replacement with an 11t to allow 7spd to be converted to 8spd and run a higher gear)
(that's from menory, so I'm sure there's a mistake there somewhere and someone will correct me!)
compact drive are 94 outer PCD and can be either 4 or 5 arm
generally the smaller PCD the smaller size rings you can run, hence old cranks running 26-36-48 and newer ones having 24-34-44 or similar, although just to confuse this Suntour microdive had a 20/22t inner (i think)
standard drive also tended to run a 12t at the back, with compact running an 11t (although BITD TNT made a lock ring replacement with an 11t to allow 7spd to be converted to 8spd and run a higher gear)
(that's from menory, so I'm sure there's a mistake there somewhere and someone will correct me!)
to find out which type you have measure between two adjacent bolts and follow this link:
http://www.suginoltd.co.jp/chainrings_standard_e.html
http://www.suginoltd.co.jp/chainrings_standard_e.html
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