Stupid question - w...
 

[Closed] Stupid question - why wouldnt you use road cranks on on an XC bike with 1 x 10?

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Other than chainring size (would use single 34t anyway) and bb (would use a new ISIS 73mm shell) is there any reason it wont work?


 
Posted : 24/10/2010 5:38 pm
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different Q factor, crank arms might hit the chainstays or be very close i think


 
Posted : 24/10/2010 5:44 pm
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? might just foul yer chainstays, either with the crank end or the chainring ?
edit: bah !


 
Posted : 24/10/2010 5:48 pm
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Bottom bracket axle is too short, or crank arm too narrow. Either way they don't usually fit.


 
Posted : 24/10/2010 5:56 pm
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More trouble than its worth then.


 
Posted : 24/10/2010 6:10 pm
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yup usually narrower chainline so as above may fowl the chain stays ๐Ÿ™‚


 
Posted : 24/10/2010 6:14 pm
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Could you use a longer BB axel to compensate? May work for your ISIS and SqTpr but could be a problem for HT11...


 
Posted : 24/10/2010 6:22 pm
 GW
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if you are buying a new BB all you need to do is buy one with a long enough axle that the crank arms sit far enough apart so as not to foul your frame.
if the chainring fouls the frame in the inner position (unlikely with a 34T) all you'd have to do is fit it to the outer position.

Vouilloz used to run Shimano road cranks on his mega (winning) bike.


 
Posted : 24/10/2010 6:28 pm
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Mate put a Sora triple chainset onto a Scott ht frame for urban adventure racing, fitted the BB ok but the crank end was coming very close to the chainstay


 
Posted : 24/10/2010 6:29 pm
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The chainset is isis and needs a bb anyway. Surely a bb width of 73mm will work irrespective of road or mtb as its the bb tat determines the width. Ill be rinning a single 34t in the middle position anyway, no issues with ring hitting chainstay.


 
Posted : 24/10/2010 6:30 pm
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bb will dictate width but road cranks have a lower profile the MTB cranks (only 2 chainrings to fit in) triple cranks might work though with the granny removed


 
Posted : 24/10/2010 6:37 pm
 mrmo
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The chainset is isis and needs a bb anyway. Surely a bb width of 73mm will work irrespective of road or mtb as its the bb tat determines the width. Ill be rinning a single 34t in the middle position anyway, no issues with ring hitting chainstay.

the bottom bracket is irrelevant, each chainset has a "correct" length bottom bracket for best chainline. Road cranks tend to be designed with narrow chainstays in mind and low Q factors, MTBs are designed with wide chainstays and cranks are splayed out to avoid fowling. The issue of chainring sizes also has an effect.

You MAY be ok running a Road crank on an MTB but you may not.


 
Posted : 24/10/2010 6:40 pm
 GW
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FFS! the BB length is the most relivent part!
fit a longer axle and the crank Q factor is increased. (allowing room for the chainring too.

working out exactly what axle length to buy is the only tricky part.


 
Posted : 24/10/2010 10:05 pm