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Old 05-25-11, 03:03 PM   #1
tjk23 
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Chainring Question

I currently am running a compact (110mm) 52/38 FSA chainring. I have a big ride coming up in June in the mountains 100 mile 13000 ft of climbing. I am wanting to put a 34t inner ring on and am wondering what exactly I need to do. Are all brands compatible as long as they are 110mm? I have found some on ebay for around $20 just wondering if it would work. I don't want to spend a lot on it because it will be used very little, just want to make sure it will work without problems.

http://shop.ebay.com/i.html?_nkw=34t...43c4d2f8&vil=1
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Old 05-25-11, 03:28 PM   #2
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The shift may not be as smooth, but it will work.
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Old 05-25-11, 06:07 PM   #3
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It is a big jump, , 18 teeth , you could pick up a smaller big chairing too..
or make the small one a 36 52 combo, those were really common
on bikes in the past.
50, 34 or 48 34 are the new thing..

should be able to change chainrings without removing
the crank.
need a 5mm allen wrench and a special but inexpensive tool
to hold onto the nut on the opposite side,ring nut has notches

Your local bike shop is where i'd look 1st.

Last edited by fietsbob; 05-25-11 at 06:18 PM.
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Old 05-25-11, 06:17 PM   #4
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I mainly looking to just change the small ring for some of the steeper climbs. One of the major climbs has some 18-20% grades and is 63 miles into the ride.
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Old 05-25-11, 08:54 PM   #5
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52 and 34 make too big of a jump, and may cause chain problems with the derailleurs.
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Old 05-25-11, 11:38 PM   #6
Chris_W
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There is no need to change the big ring if you're prepared to put up with the big change in cadence when shifting. The 52-34 jump should work OK, but not super smooth. If you can install a Third Eye Chain Watcher or K-Edge Chain Catcher to prevent the chain from derailling off the inside then that would be a good safety precaution.

To get as low as gear as possible for those 20% walls then you could even get a 33 tooth inner ring, TA Specialites makes one, but many companies have 34 as their smallest 110 BCD ring.
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Old 05-25-11, 11:53 PM   #7
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once you are in that small gear , you need to be at the crest of the hill
and coasting down the other side to do that upshift, and in that low ring
there is a likely hood of dragging the chain against the side of the big chainring

in the smaller gears on the rear wheel..

check out the ratios : http://sheldonbrown.com/gears/
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