wayneIII

anybody successfully run a bigger cassette than the 11-32 that sram says you can run with their wifli rear derailers? Wondering if a 34t or even a 36t option is possible withought having to use a MTB rear der.


thanks.

bikepro

You might get it to work with a cog larger than 32 but you risk damaging the RD. You'll be trying to find a balance between too much slack in the small ring -- smallest cog and chain too tight in the large - large combination. Even if you don't like to cross-chain, you can easily hit these combinations.

rangerdavid

what he said.



no scram

phread59

I ditched the Apex WiFli rear. I used an X-9 and went 11-36 PC1070 cassette. The X-9 works better than the Apex. Shifts smoother and more precisly. The stock rear is maxed at 32. I don't think you can get any bigger.

Mark shuman

c_mack9

I have sram and always wondered what wifli was. Can you give it to me in lamens terms please?

TrojanHorse

It's a mid-cage rear derailleur, so you can use up to a 32 tooth cog in your cassette.

The normal rear derailleurs are limited to 26 (I think it's 26, I use a 28 with no apparent problems)

bikepro

It's just a medium cage RD that accommodates cogs with up to 32 teeth.

https://www.sram.com/sram/road/produc...ear-derailleur

Stickyrunner01

WIder Faster LIghter

c_mack9

Thanks, that makes more sense to me than their site. I have 2013 Red 10 speed, 11-28t cassette.

wayneIII

Thanks for the responses- I should point out that I will be running a single ring in front, cross chain not an issue. Does that matter at all?

RollCNY

Just as a for what its worth, and you probably have this figured out already, but chainline with a single ring becomes fairly important, and you may very well need a means of retaining your chain on the single sprocket.

I ran a 1x9 for awhile, with a 46T coupled to a 12-25. With the chainring mounted outboard, I would loose the chain to the outside in cases where I was rapidly shifting to smaller rear cogs. For instance, cresting a hill and wanting to quickly accelerate down the far side, the chain would come off. My theory was that the rapid creation of slack under some load let the chain ride up and off in the front. I ended up moving the 46T to the inside, and putting on a bash guard sized appropriately, and never had the issue again.

Werkin

The SRAM mid cage derailleur will work with a 34t sprocket if the derailleur hanger is long enough.

A single front ring will not exceed the chain wrap capacity of the road mid cage derailleur. A road mid cage is longer than necessary.

Setting the gap for the road upper cage pulley to clear the 34t sprocket will cause slightly slower shifting in the smallest cogs.

As already stated, a better match would be MTB RD, and a short cage is sufficient. If you're riding over rough pavement while shifting there is increased risk of chain suck and chain drop when at the extreme ends of the cassette (single crank) or at one end (modified double crank), especially with the weak cage spring of a road derailleur. A chain guide and/or cage clutch would be beneficial. A Type II SRAM derailleur is much better suited for this type of application.

bikepro

Yes it does. As long as the RD will actually shift to the larger cogs and you have the chain long enough, it may be ok. With a singe ring, you just need to size the chain for the large-large combination. Just be sure to get the chain long enough.