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I currently have a 50/34 chainset however I would like to change this for a 53/39... How straightforward is this to do myself?! Is there anything else i would need to change? Thanks

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Paul J [908 posts] 3 years ago
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It's fairly straight-forward. 5 minute job once you have the right tools.

a) Purchase new chain-rings - make sure they are the right "Bolt Circle Diameter" (BCD) for your crankset's spider. If you have a 50/34, your crankset almost certainly is the "compact" 110mm BCD (as opposed to the 130mm "double" standard).

b) Purchase spare chain-bolt rings. You always seem to break at least one when you change rings. I'd recommend steel, the aly are just to soft & fragile.

c) You need a good length ratcheting socket wrench, with the right size allen bolt head. You need either a flat screw-driver, or another allen wrench, to hold the other side of the chain-ring-bolt.

Process is easy, unscrew the bolts, slide the chain-rings off over the crank, slide on the new ones, torque up the chain-ring-bolts :). Then you need to adjust the height of your front dérailleur - loosen the actuating wire, loosen the FD clamp bolt, raise the FD, tighten the clamp & wire, adjust FD as needed.

Note, you might not find 110mm 53/39 rings - those tend to available only for 130mm BCD. But you can get 52/38 and maybe 36.

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kjonesy83 [1 post] 3 years ago
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Paul - Thanks very much for that!

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700c [981 posts] 3 years ago
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Paul wrote:

Note, you might not find 110mm 53/39 rings - those tend to available only for 130mm BCD. But you can get 52/38 and maybe 36.

And this is the problem!

I've been looking for 53t in 110bcd for a while, with no luck. I've only seen custom sets available at great expense..

So your only option may be to replace crankset in it's entirety

I'd be v interested to know if you find a solution though

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pirnie [199 posts] 3 years ago
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Don't forget to think about chain length. Going from a compact to a double, you might not have enough slack in the chain so a new one might be required.

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Guido [43 posts] 3 years ago
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You will also need to move your front derailleur up to accommodate the extra height of the chain rings.

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Fringe [1047 posts] 3 years ago
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700c wrote:
Paul wrote:

Note, you might not find 110mm 53/39 rings - those tend to available only for 130mm BCD. But you can get 52/38 and maybe 36.

And this is the problem!

I've been looking for 53t in 110bcd for a while, with no luck. I've only seen custom sets available at great expense..

So your only option may be to replace crankset in it's entirety

I'd be v interested to know if you find a solution though

'ere you go, 110BCD 53T.
http://www.spacycles.co.uk/products.php?plid=m2b0s113p1727

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racingcondor [218 posts] 3 years ago
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Or just go for a 52 big ring for virtually no difference.

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Raleigh [1667 posts] 3 years ago
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Or if you want to Pardy go and get some Q rings...

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SammyG [275 posts] 3 years ago
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I got a Sram force double crankset for £78 on eBay , is your compact worn out?

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robdaykin (not verified) [368 posts] 3 years ago
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Fringe wrote:

'ere you go, 110BCD 53T.
http://www.spacycles.co.uk/products.php?plid=m2b0s113p1727

one note of caution, I bought a triple with those rings and TA don't seem to have spent much time changing gear. They commonly drop the chain instead of changing up.

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700c [981 posts] 3 years ago
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robdaykin wrote:
Fringe wrote:

'ere you go, 110BCD 53T.
http://www.spacycles.co.uk/products.php?plid=m2b0s113p1727

one note of caution, I bought a triple with those rings and TA don't seem to have spent much time changing gear. They commonly drop the chain instead of changing up.

Thanks Fringe, great range of custom sizes on that site and I presume compatibility across shimano and campag.

Would be useful to get anybody else's experience? Sorry for hijacking the thread..

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Paul J [908 posts] 3 years ago
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Is it really worth replacing the whole crankset to get 53T? I'd suggest only if your bike rides are downhill in both directions.  3

Note that if your rear cassette has a 12T as smallest cog, then changing it to a 11T gets you a larger gear with a 52T front, than a 53T would with the 12T. I.e. 53/12 is *less* than 52/11.