scale

I am in the market for a 7 speed rear cassette and want to make sure it will work with my rear derailleur.

I have a suntour superbe pro and am currently looking at the sram p730 12/32 Here

or the shimano 11/24 CS-HG 41-7 - 586287 Here

Anyone running a older suntour superbe pro with a 32t? I imagine the shimano would work with a 28t.

The sram looks better.

My current road bike (6sp) only has a 24t and i have never really needed any more. It is pretty flat around here but im getting up in age and it would be nice to have options.

Anyway......let me know the biggest rear cog you can run with a Suntour Superbe rear mech.

Thank you!

bikemig 

superbe pro can't handle much. This website lists the capacity: VeloBase.com - Component: SunTour RD-SB00-SS8, Superbe Pro

There are different models so you'll have to search around to find yours. I think they all topped out at 26 teeth. There are a lot of variables so your bike may be able to handle 28.

It will not handle 32 teeth. At that point, get a suntour cyclone or suntour vgt RD.

clubman 

I think the era of 7 speed SuperbePro/Sprint 9000 gears were all short cage and were rated for max 26 teeth but will shift 28. I doubt anything bigger would work.

Just found a pic with both Superbe and Sprint. Yup, max 26.

scale

Thanks thats one i have. Heck....does anyone even made a 26t 7sp cassette? I see some shimano cassettes are 13-26 but they are marketed as mtb cassettes. I dont know if 13t would be small enough for road use. It believe they go 13t-15t and up so it even skips 14t in the cluster. Looks like i will have to try and find a different rear mech at this point maybe. That superbe pro is so purty though I have had it forever and was waiting to use it on a build at some point.

LeicaLad 

You can build your own cassette from loose cogs. They should match, of course, but you can buy, say, a corncob cassette to get the tight low numbers, and then add the larger cogs from another cassette. Build the gear spread that you want.

That said, the Superbe Pro is a great derailleur, but it'll be a stretch to reach 28t, at the very most. (Most ratings like this are a tad conservative, which is why I think 28t may be the real max.)

ymmv, of course.

scale

yeah....i have a found a few 13-26t cassettes and i could mix and match i guess. Either way......it will be suntour on shimano gears.....and chances are i will have to run friction mode. I Have this fancy superbe pro rear mech and the matching fancier downtube shifters. Id like to put them to work. It's a shame to have to run friction but who cares...

If i cant make it work, ill switch over to shimano downtube shifters and call it done. I just love the old suntour stuff (and i know their indexing was one of the reasons they failed and are gone now). I must say.....i have a 6sp shimano 600 freewheel and that shifts perfectly with the suntour accushift 5000 stuff all day long. I have 5000+ miles on that setup and never had a problem.

plonz 

The Shimano HG50 cassette is a 7spd with 13-26/28/32 options.

Shimano HG50 7-SPEED Cassette > Components > Drivetrain > Cassettes | Jenson USA

bikemig 

Yep or you could check this out, RoadLink ? wolftoothcomponents.com

It's not really designed for 7 speed but it's worth an e-mail to wolf tooth to see if it will work. This may let you run a 28 or even a 30 with that RD.

T-Mar

One question which hasn't been addressed, is index compatibility. Is it the derailleur an AccuShift version and does the OP want index capability? If so, both freewheels mentioned are designed for SIS, which has different cog to cog spacing. It will index properly over most of the cogs but not all of them.

The biggest influence on maximum cog size, outside of the derailleur itself, is the dropout hanger geometry. I have Superbe Pro Accushift on a bicycle where I have to put the wheel all the way back in the dropout and carefully adjust B-screw spring tension and chain length to get it to handle 28T. 30T isn't possible, let alone 32T. Even at 28T, there's a noticeable loss of crispness in the shifting. The OP might be better or worse off, depending on the length of his hanger.

scale

Neat. I will do that. That would be great if this worked.

bikemig 

Let me know if this works. It would be a great way to get a suntour superbe pro work with a little larger cluster. The idea is pretty straightforward inasmuch as a longer derailleur hanger should in theory let you use the RD with a little larger freewheel. Still that wolf adapter was designed for modern drive trains and could well not work with an old school short cage RD.

ThermionicScott 

Ignore whether "road" or "MTB" is checked on the box. Shimano's 7-speed (Hyperglide) cassettes are all functionally identical.

Universal Cycles usually has a good selection: https://www.universalcycles.com/shop...hp?category=42