This thread’s a gold mine re my current stupid bike project. Thanks guys!
I’ve got a 6703 I could put to good use.
there is a new 105 derailler with a 32 tooth max, dura ace with a 33 tooth max, and ultegra 6700a with a 30 tooth max…
For SRAM they’re really all road cassettes except for the 36t ones, which is why the PG-1070 12-32t cassette is fucking heaven on earth
Shimano started making a 12-30t cassette last year that isn’t bad, but otherwise every big cassette they make is fucking awful for road use[/quote]
But what is the actual difference? Different cog/ramp profile that makes them louder/shift worse or something? I’d want more than 30T and probably more than 32T as well. Leaning towards 36T and trying to figure out whether to go sram or shimano if I do it. Maybe the 34T sram if it exists and is somehow better than the 36T (edit: I see it only exists for 9 speed).[/quote]
the gear choice on the big Shimano options are pretty bad for road use, you get stuck with a stupid 11t cog
and all the jumps are gigantic at the fast end, though they do sometimes give you one closer shift in the upper-middle vs SRAM
SRAM:
12-13-14-15-16-17-19-21-24-27
11-12-13-14-15-17-19-22-25-28
12-13-14-15-16-17-19-22-25-28
11-12-13-14-16-18-21-24-28-32
[b]12-13-14-15-17-19-22-25-28-32[/b] (my fave)
11-12-14-16-18-21-24-28-32-36
12-13-15-17-19-22-25-28-32-36
Shimano:
12-13-14-15-16-17-19-21-24-27
11-12-13-14-15-17-19-21-24-28
[b]12-13-14-15-17-19-21-24-27-30[/b] (new road jawn)
11-12-14-16-18-20-22-25-28-32
11-13-15-17-19-21-23-26-30-34
11-13-15-17-19-21-24-28-32-36[/quote]
Thanks, now I get it. The sram 12-32 is indeed a good distribution. If I had a triple with a 30T granny up front I would go with that. With the 50-34 double I have, I think I’ll go with a 36T in the back… and if I do, it doesn’t matter whether I do sram or shimano. The 11T is totally pointless but it doesn’t matter much given how stretched out the gears are with an X-36 anyway. If I had a free pick of cogs I’d probably go with something like 13-14-15-17-19-22-25-28-32-36. I don’t think I ever used the 50/12. Fuck, maybe even start with 14. I’m sure I can spin 50/14 up to 40mph at least.
Anyone wanna comment on this vs a large range cassette? One issue I see is that I may need a longer axle to get a decent chainline. Another is that my existing FD might not be too happy with a 28T small ring.
There’s an old Ultegra triple crankset for sale at one of the local shops that I could potentially do this with, if they’re willing to switch the rings on it. It’s from the 9-speed era but I’d be switching out the rings anyway. BTW do “9-speed” front rings work OK with10-speed chains?
Anyone wanna comment on this vs a large range cassette? One issue I see is that I may need a longer axle to get a decent chainline. Another is that my existing FD might not be too happy with a 28T small ring.[/quote]
[quote=lofarkas]
Thanks, now I get it. The sram 12-32 is indeed a good distribution. If I had a triple with a 30T granny up front I would go with that. With the 50-34 double I have, I think I’ll go with a 36T in the back… and if I do, it doesn’t matter whether I do sram or shimano. The 11T is totally pointless but it doesn’t matter much given how stretched out the gears are with an X-36 anyway. If I had a free pick of cogs I’d probably go with something like 13-14-15-17-19-22-25-28-32-36. I don’t think I ever used the 50/12. Fuck, maybe even start with 14. I’m sure I can spin 50/14 up to 40mph at least.[/quote]
Aaaand now you see why I like my 44/29 (or similar 46/30) double crankset when paired with a 11-27 or 11-30 cassette. It’s sort of the same as your 50/34 with 14-36 idea, except a bit easier to actually achieve. (a side bonus is smaller/lighter cogs and rings, less chain, tighter cassette, short cage derailleur, more clearance for hopping curbs and logs).
Go here and play around:
http://yojimg.net/bike/web_tools/gearcalc.php
42/11 is only slightly easier than 50/13, and is actually a taller gear than 50/14. I like a 44/11 top end combo. The way it works out in practice is that I basically have a 1x10 set up, staying in the 44 ring almost all of the time. Then when a hill appears, I drop to the 30 and stay there for a while. There’s much less front shifting (for me and how I ride) than with a 50x34.
Anyone wanna comment on this vs a large range cassette? One issue I see is that I may need a longer axle to get a decent chainline. Another is that my existing FD might not be too happy with a 28T small ring.
There’s an old Ultegra triple crankset for sale at one of the local shops that I could potentially do this with, if they’re willing to switch the rings on it. It’s from the 9-speed era but I’d be switching out the rings anyway. BTW do “9-speed” front rings work OK with10-speed chains?[/quote]
Chainline will be fine, because you’ll want to use the 42 as a 1x set up and be able to shift across the whole cassette while on it. When you drop to the 28 you’ll only be able to use your 4 or 5 largest cogs without getting chain rub on the big ring, but that’s OK, because this will be your hill-climbing granny low.
A regular old double pusher will shift this fine, but if you have extra fatty chainstays, you may not be able to adjust it low enough for your liking. It’ll probably be fine, though. I’ve had no issues with the aforementioned 44/29 combo on various bikes.
9-speed rings are probably OK with 10-speed chains. Not great, but we’re talking about weird geraing and FD issues anyways. Don’t expect awesome front shifting, but it won’t be a big deal because you won’t be shifting that often up front anyhows.
Make your own cassette?
Start here
So, if I have a triple, 52/39/30 and I wanna convert it to 46/30, what chainring(s) do I use?
A 46 cut as an “inner” or “middle”. TA makes one.
Shouldn’t that be “outer” or “middle”?
Inner or middle cos of the bolt recesses, I suppose.
I can’t imagine it makes that much difference though. Longer bolts aren’t that hard to find. Unless I’m missing something? I’d buy a Shimano CX70 46t ring and give it a shot, if it were me.
You’re going to be mounting it on the middle position. An “outer” chainring will have bolt recesses on the wrong side so the bolt head might stick out into the space where the chain needs to be.
Usually the only difference between an inner and a middle is shifter ramps, and since it’s a nonstandard combination those aren’t going to be placed right do much for you anyway.
Nice. Ratio talk. Could’ve used this thread a couple weeks ago. Now I’ve got my digits crossed for this setup to work out:
Chorus 10s shakes
Shiftmate #4
medium cage Shimano dangler
Shimano 11-28
Truvativ 48/34 (9s?)
Shimano 9s pusher
Can’t be bothered think if I overlooked an issue after reading so many compatibility threads. Fucking troubleshooting printers and asking if this Shimano part will work with that one takes up about half of the non-porn internet.
I just ordered the TA one from wiggle. I can tell you how it works in a couple weeks.
I’m also gonna run a guard on the outside cos cheap and no dropped chains. Action (distro) has a silver 46-48t one in 130.
I just ordered the TA one from wiggle. I can tell you how it works in a couple weeks.
I’m also gonna run a guard on the outside cos cheap and no dropped chains. Action (distro) has a silver 46-48t one in 130.[/quote]
Got a link to the part? My BCD is 130mm so the aforementioned CX70 chainring won’t work.
Gonna be stoked if this works and I can make a stupid climbing bike.
This guy?
http://www.wiggle.co.uk/ta-130-pcd-alize-inner-chainrings-38-46t/
yeah. I must have gotten the last one.
ribble has it in stock too, but merrikan sources (Peter White and Harris) didn’t show its existence.
Guess nobody really makes a 130mm “middle” chainring any more. Think I might do a 44/28 setup on my triple. That with a 11-32 cassette ought to work out okay.
I decided to go with a big cassette as changing the cranks is too big of a pain in the ass.
Now, help me choose parts!!
I’m more or less set on this cassette:
What RD do I get? I want something in the general price/quality area of LX/XT, preferably silver. Do I get the Deore LX (RD-T661)? What else is there that’s a somewhat recent model and works with 10s brifters? Are all shadow RDs out as well as anything labeled dyna-sys? I guess I need an SGS version, whatever I buy, but should I care if Shimano lists something as max 32T when I’m running a 36T?
This is to go with 105 brifters and a 105 hub on a 2x10 (50/34 in the front).