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PostPosted: Fri Apr 27, 2007 2:27 pm 
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Location: Mansfield, Notts
I know this is gonna sound a bit thick but whats the difference between compact and standard drive cranks/chainrings, and how do I know which my crank takes?, is it something to do with the bolt circle?


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PostPosted: Fri Apr 27, 2007 2:36 pm 
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Yep, and the number of teeth, altough i see you can get XT with 48, 36, 26 rings as well as the 44, 34, 24.


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PostPosted: Fri Apr 27, 2007 2:57 pm 
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Location: High Peak
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


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PostPosted: Fri Apr 27, 2007 3:04 pm 
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Location: Oxfordshire
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!)


Last edited by kona kid on Sat Apr 28, 2007 9:47 am, edited 1 time in total.

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PostPosted: Fri Apr 27, 2007 3:07 pm 
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Location: Oxfordshire
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


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PostPosted: Sat Apr 28, 2007 9:19 am 
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Location: Mansfield, Notts
Cheers, thanks alot, think mine must be just standard drive then already run the risk of just buying 2 middleburn rings smallest and largest and they seem to fit so need to just find the middle but at least I know its standard I'm looking for now.


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