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can I use a mountain double crankset on a cx bike in a 1X configuration?

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can I use a mountain double crankset on a cx bike in a 1X configuration?

Old 10-21-13, 06:30 PM
  #1  
jcharles00
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can I use a mountain double crankset on a cx bike in a 1X configuration?

I built up a cross bike with some old campy gear because I got a good deal on it... but, the shifters appear to be borked, (and I'd rather use shimano/sram anyway) so I'm looking for other ways to get the bike rideable.

I have an extra shimano wheelset and a new sram x7 double crankset that was a mis-purchase. I'm thinking maybe these parts along with a SRAM R lever, X7 rear derailleur, and a mountain 10sp casette might make a solid but relatively inexpensive 1x10 setup. my concern is the chainline. the x7 cranks have external BB, and my intent would be to use the 42T (big) chainring.

Anyone know if this would work out?

FWIW, the frame is a colnago dream cx from sometime in the early 00's
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Old 10-21-13, 06:46 PM
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striknein
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Chainline will be beyond screwy after about the 5th cog. I'd be very concerned about the chain dropping as you start to approach the granny cog.

Aside from that and a potentially noisy drivetrain, you'd probably be ok. We're only talking about 4mm or so of difference.
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Old 10-21-13, 07:01 PM
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I never built 1x10 but did built several 1x8, 1x9 and 1x7 for friends. I used road cranks on MTB frames and MTB cranks on road. While up to 1x7 I never had to use chain guide of some sort - 1x8 and 1x9 always required some sort of it. My favorite is chain spy - http://www.jensonusa.com/Problem-Solvers-Chain-Spy
If you plan to run fenders - makes sure it fits first before doing final build
And while I did (and still use) up to 5mm spacers on standard sealed cartridge BBs (to get desired chainline) - I find it much more easy to adjust chainline with external BBs.
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Old 10-21-13, 07:02 PM
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+1 to being noisy. Btw, may be worth it to post on mtbr forums - lots of folks run 1xx setup with or without chain guides
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Old 10-21-13, 08:19 PM
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Install the crank and measure the chainline to find out. Since MTBs have 135mm rears and I'm guessing your Colnago has a 130mm rear I would suspect using the inner position on the crank might get you decent chainline. I would expect the outer position to be way off.

FWIW I wanted ideal chainine on my CX 1x8 setup so I went with a road triple and used the middle ring position.
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