Is it possible?

[MissyR]

I bought a CAADX (2017) last October. I'm looking to put a bigger cassette on the back, possibly a 11-34 does anyone know if this can be done without changing to many components on the bike. Its running shimano 105 46/36 and an 11-28 at the moment.

TIA H x

 

[robgul]

Have a look at the mech and get the model number - it'll be RD xxx and then look up the product on Shimano's website or the product details at CRC - see whether it's standard or GS and it'll give you the max cassette sprocket you can use (Shimano is usually cautious and you can usually get another couple of teeth).

Chances are you'll get away with it, although a new longer chain is probable. If the B-screw doesn't push the mech back far enough the classic MTB bodge is to take the mech off and screw the screw in from the other side (giving you the thickness of the screw head as extra length)

Rob

 

[ColinJ]

I converted my 10-speed CAADX to give a much more West Yorkshire 20+% hill-friendly 34/36 bottom gear. Details HERE.

 

[Venod]

I am running running 11-32 with a 46/36 chainset, short cage rear mech, no problems, but I don't know if it would take a 34 without changing the derailleur, you could try it.

 

[Cycleops]

The problem will be that the mech will run too close to the cassette with a short cage. One solution is obviously buying a long cage but you can get around it by using this device which drops the mech away allowing a short cage to be used;
https://www.sjscycles.co.uk/gear-spares/aluminum-rear-derailleur-hanger-extender/
This is the same the same thing with a silly name and price:


View: https://youtu.be/_WBk2eLP24Y

You'll need a new longer chain.

 

[robgul]

The problem will be that the mech will run too close to the cassette with a short cage. One solution is obviously buying a long cage but you can get around it by using this device which drops the mech away allowing a short cage to be used;
https://www.sjscycles.co.uk/gear-spares/aluminum-rear-derailleur-hanger-extender/
This is the same the same thing with a silly name and price:


View: https://youtu.be/_WBk2eLP24Y

You'll need a new longer chain.

The extender is an option BUT a) Shimano would not warrant the mech if you bust it, and b) ditto the bike manufacturer. Their view being that the extra potential strain on the existing mech hanger and frame is significantly greater. That said, they do work - caveat emptor.

Rob

 

[fossyant]

PS no-one will warrant mechs - You bust it, a few months from buying, it's your fault.

Best bet is to look at the serial numbers on the back of the mech. The Wolf tooth's work well on MTB's and potentially, it might help save your gear hanger in a fall, but it might not.

 

[fossyant]

PS you won't bust a mech.

It will only happen if:-

You don't set the limit screws (don't trust the shop)
You don't check any funny noises quickly.
You don't keep away from cross chaining - it will work, but not a good idea
You never clean it

I've never broken a mech, in 32 years of road and MTB. Even avoided crash damage (I usually remember to fall on the left