Sora Double Chainring on Triple Crank

instinct

Hi, can anyone tell me if i will have issue doing the following. My bike came standard with a Sora 3*9 setup.

http://www.chainreactioncycles.com/Models.aspx?ModelID=43206

Id like to change the outer chain ring to 52t but the one I am thinking of getting is for 7/8 speed setup.

http://www.chainreactioncycles.com/Models.aspx?ModelID=18521

Will there just be chain line issue when running big ring front and large ring rear ? If that is going to be the only problem I can live with that.

cdaly_

I'd say you'd get away with it. I'm running a sora triple 8sp chainset with a 9sp chain and the rest without problem.

That said, you probably don't need a 52t ring. Instead, you need to pedal faster. Higher cadence means less strain on your joints, therefore lower impact exercise.

clog

You might have a problem with the front mech as the Sora mech is designed for a max of 50t outer ring. The older model shimano mechs are designed for a 52t outer ring and can be picked up cheap enough.

lennymc

what cassette have you got on it? If you go to an 11 (if you dont have one allready) on the back the 50 11 should give you bigger gearing than a 52 12.

instinct

specs says its 12-15t and upfront is 50-39-30.

my figuring was that if I had 52-39-30 upfront I would have gearing like a Double setup. Granny is never used and in hindsight I should never have bought the triple.

lennymc

do you mean 12 - 25? If so id look at getting an 11, it would be the easiest thing to change and you wont have any compatibility issues. thats not to say the other chainring wouldnt work tho. It may, but you may have issues.

instinct

doh, yeah a typo there. 12-25

Cool Ill consider that Lenny. Not mad into modifying the road bike but sick of the noisy clattery triple setup.