tkehler

Here's my set up.

Crank: R700 compact 50-34 (10 sp, obviously)
FD: Shimano Ultegra 6700
RD: Shimano Ultegra 6700
Brakes: Ultegra 6600
Shifters: Dura Ace bar end (the 7800 series, not the cooler new ones, the SL-BS79)
Chain: KMC 10.93
Brake levers: I dunno, Tektro's?
Cassette: !?!?!

Was thinking about a SRAM 1070 11-28 cassette...

But only because I have one lying around.

Cheers

dalava

SRAM will work. I have it and like it very much.

ls0725

Shimano Ultegra CS-6700 11-25 or 11-28 for about $70.00

halfspeed

1) Determine budget
2) Determine gear ratio
3) Find matching SRAM or Shimano cassette

Nobody can really help you with any of those steps. It's all personal preference. Or am I missing some wrinkle?

tkehler

Budget? Somewhere between my wife's preferred budget of ZERO dollars ("you have 4 bikes, can't you move this 'cassette' thing around from bike to bike?" and my preferred budget of one thousand dollars for a ____ium custom rear cassette.

Gear ratio? Doesn't matter that much. It's for a folding road bike (Airnimal). Can't see doing too many big ascents on it, to be honest. I should be strong enough for what I'll encounter on it. Something general, all-around with a 27 or 28 for the odd big hill should suffice.

I was just vaguely worried about compatibility.

Thanks

tkehler

Hmmm. The symmetry of having mostly Ultegra appeals to me... Good, I'll consider it some more.

Thanks

SebastionMerckx

Just put a 105 cassette on there and be done with it.

tkehler

I was wondering about it with the 6700 stuff. But you're happy with it? Okie dokie, sounds good.

Thanks

halfspeed

Sounds like you should use the SRAM you have.

RichinPeoria

Honestly,
Its ShimaNO so it you'll be replacing it next week and therefore why does it matter?
Just say'n

Buy Campgnolo gruppos. Stay away from that off brand stuff like Shimano. You'll only have problems.

tkehler

I would love to! But it's like Mac (I mean Campy is like Mac) ... you start with PCs and then you stick with them, persistently and foolishly.

I'm even afraid of trying Campy for fear of falling into the abyss. (I did get SRAM Force, though, but that was a fluke -- someone practically gifted me a used gruppo.)

RichinPeoria

The term "gruppo" is to be used exclusively for Campagnolo parts sets only.

jdon

or you speak Italian in which case, "gruppo" applies to all.

Beaker

Not sure what you're looking for here. I run both Shimano and SRAM cassettes and find both perform well. If you don't regularly need 34x28, then I'd put in a vote for 11-26 as my favourite hilly terrain cassette. The 21-23-26 progression is tight enough to not cause me to fark up my cadence too much, and I've gotten up some absolutely ridiculous grades with a 34x26.

tkehler

Actually what you wrote is what I'm looking for. That helped. 11-26 is good. So it's between that and 11-28 (which at least I've got).

Cheers!

tkehler

Okay then, is there any reason why I should have the 6700 cassette as opposed to any other Shimano ten speed cassette?

tkehler

Bizarre -- there's a 16-27 cassette! (Ultegra 6600 16-27T, to be exact). Just noticed this while looking around Ebay. Never knew that ... because it's not one I'd ever want, but okay, cool

Beaker

11-26 is SRAM only. 11-25 would be 6700.

ls0725

to match your FD & RD?

canam73

I'm guessing you have considered this, but I know a lot (all?) folders have less than 700c wheels. That will lower your over all gear ratio, correct?

tkehler

Um, well, it's a 24" wheelset Airnimal racing folding bike.

As it happens, I have NOT done the calculations. What the *$)#*^! do you think you're here for?

In other words, tell me what this means for the gearing, please.

tkehler

That's as good as reason as any.

(Is it me, or does these kind of symmetry things start to matter? Never thought they would, but lately I've been trying to get my seatposts and stems to match, or my bars and stems, on various bikes. Crazy or what...)

nitropowered

I think you would want a standard crank and an 11t cog with those 24" wheels. You are going to run out of gear otherwise

kudude

this means that a 27 with those wheels will feel like about at 30T cassette.
you could probably get away with a 11-23 if you find it on closeout.

what this really means, is that the gear ratios determine how many times the wheel goes around for each time you pedal. your wheels happen to be smaller, so one time around for them doesn't get you as far as on a 700c bike. therefore it's easier to pedal for a given set of gears

tkehler

Well, good thing I've got a compact crank on this thing, rather than a triple. Sheesh.

Anyhow, thanks for dumbing it down for me. I will look for something like an 11-23.