davida

I know that in theory running a 11-32 cassette with a standard 6700 RD should be problematic, but I was reading elsewhere about someone running a standard 7900 RD with a 11-32 cassette.

Anyone out there doing this?

Is it necessary to change the little sprockets in the cassette?

creativepart

I'm running a 13-30 with a 5700 RD (9-speed) and I don't think I'd go much bigger than 30. Sheldon Brown's website says that 30 works for sure, but shimano says 28 is max. I trusted Sheldon and bought his 13-30. I'm having no issues.

He sells premade "custom" ratio cassette and they are built out of shimano parts.

I just checked and he says the 32 cassette needs a long cage DR -- a mountain bike DR.

https://sheldonbrown.com/harris/k7.html#10cassettes

merlinextraligh

You've got two issues, 1) handling going to the 32 tooth cog, and 2) enough chain wrap to account for the chainlink difference between the big/big - little/little combination.

With a bit of tweaking with the B screw, you likely should be able to get it to shift acceptably ( if you're not too picky) to the 32. ( I used a long cage 105 RD with an 11-32 without significant difficulty)

So the issue becomes chain wrap. And that will depend in part on the difference between the 2 front chainrings. The derailuer is rated for 33 teeth capacity. With an 11-32, and 53/39, you're at 35 teeth, just two above the rated capacity. Which likely would work, if you can tolerate the chain being loose in the last couple of litt/little combos and stay out of those. Going with a 50/34 would push it three more teeth past capacity.

One way to find out.

banerjek

Just out of curiosity, were you using long cage or short cage? I've seen people do the B screw thing on an 11-32 with a long cage DA -- presumably the same would work with Ultegra. I've never seen this done with short cage.

But this is really pushing it. Much better to just get an RD that can handle the wrap. A long cage XT RD will easily handle the huge cog and the chain wrap without any futzing. It takes about the same amount of time to swap out RD's as it does a cassette, so that would be my vote.

I have a pie plate cassette that has only been used three times, and I bought an RD to handle it. Might sound like a waste of money but it's totally worth it on those rare occasions when you really need it.

rothenfield1

I tried a 32 with my Ultegra long cage....Nope, I couldn't get it to work. there just wasn't enough room for the chain between the upper pulley and the cog. I mean it was right there, but you could just tell that something was going to go badly wrong. Maybe a better mechanic could Jimmy it, but I'd be afraid. I'm running a 28T fine now.

ZippyThePinhead

This thread might help you.

rockon

Many people on these forums said they can like DaveT, JulieD etc

https://forums.roadbikereview.com/sho...11-32+cassette

https://forums.roadbikereview.com/sho...d.php?t=227910

robertkat

It's possible, but it's tricky. A friend has an 11-32 set up, but using a long cage 7800 derailleur. Also, the frame has horizontal dropouts, plus 46-34 crank set, so that helps shorten the chain slightly. With the axel centered all the way back in the dropouts it works.

Rowan

I just went straight for the XT SGS RD. Works like a charm.

AdelaaR

Why do you want an 11-32 though?
It'll make the intervals between the gears bigger and thus give you less usable gears.
To get lower gears, why not get a triple?

banerjek

11-32 mated with a compact gives you lower gearing than a triple.

The people who are running a setup like this will be where there are serious climbs and you tend to use your top and bottom gears so the spacing is not an issue. When not climbing, it's easy enough to swap out to a tighter cassette.

c0lnago

6700 + XT rear der + 11-34 IRD cassette...worked flawlessly.

merlinextraligh

Long cage. But theoretically at least long cage/ short cage shouldn't change whether it can shift into the 32, only whether it can wrap enough chain.

banerjek

Good point. But the chain wrap capacity on the short cage is significantly lower than long cage (and even that is short of what you really want).

I think the MTB RD route is the way to go, particularly if you have a short cage and really should get another RD. My experience is that the shifting on the XT RD is just fine. I still swap it out for my normal short cage when I'm not riding with a pie plate for cosmetic reasons.

Spookeay Bird

11-34 on a 50-39 with a long cage. Works great!