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signed: Stuck in high gear(13 posts)

signed: Stuck in high gearibasnazy1
Sep 3, 2003 11:51 AM
My bike is a Vision R65 Sabre with 24" wheels, full Ultegra. I find that most of my riding is on flat to gentle hills. I'm running in the outer ring of the 30/42/52T triple crankset about 80-85% of the time. Since the cassette shifts much faster than the crankset, I run through all 9 speeds on the cassette while shifting down to the middle ring on the crankset at stop lights. I am interested in replacing my outer chainring with something larger. I notice that Shimano makes a 53T and 54T chainring for the Ultegra. I'm guessing that I need to make the "Ultegra" distinction because of the 130MM bolt pattern? With a difference of only 1-2 teeth, I'm wondering how much difference would that make? I found one 56T Shimano chainring (at least he says it's Shimano but I didn't know they made anything larger than 54T) that has the correct 130MM bolt pattern and it looks identical to my current 52T with the exception that it doesn't have any pin pickups. 56T sounds like it would make a difference but I then question my chain length and if my cassette would be able to handle it. Suggestions are much appreciated.

signed: Stuck in high gear
can you turn it up to 11?gtx
Sep 3, 2003 1:34 PM
You didn't mention if you were running 8 or 9 speed but there should be a cassette with an 11 tooth cog for 9 speed and I think you can get a XT cassette with an 11 for 8 speed. That would probably be the cheapest and easiest. Also, you shouldn't be running in the larger cogs in back when you're in the big ring in front--too much chain angle which causes a lot of drivetrain wear. If you already have an 11 a bigger c-ring is your only bet. Those little pins and ramps help shifting but basically most 130 spaced c-rings should work. Consult a gear chart for your actual gains. Just don't try to bunny hop any logs with that big ring, but if the front der is properly adjusted you should be fine. The other answer is to follow the lead of Lance Armstrong and start pedaling at higher rpms. ;)
can you turn it up to 11?flyweight
Sep 3, 2003 3:02 PM
Chain angle isn't really an issue on a recumbent due to the long length of the chain.

Running a 56t ring on a triple would most likely not work due to the large difference between your outer and inner chainrings.
can you turn it up to 11?gtx
Sep 3, 2003 3:26 PM
I know nothing about recumbents (and had no idea that was what this post was about) but a 14 tooth difference up front is pretty standard these days. But the 11 tooth cog is still the easy bet.
can you turn it up to 11?flyweight
Sep 3, 2003 3:48 PM
It would be 16 teeth, plus it's on a triple which makes it a bit messier.

You are right, the 11t would be a much better way to go.
can you turn it up to 11?gtx
Sep 3, 2003 6:08 PM
56 - 42 = 16? ;)
can you turn it up to 11?flyweight
Sep 4, 2003 8:16 AM
My typo. Should be 26. 56-30=26 (he's running a triple, a must-have on a recumbent)
can you turn it up to 11?gtx
Sep 4, 2003 8:49 AM
I was referring to the tooth difference between the big ring (56 if that's what the poster wanted) and the middle ring (42). So you're saying the rear der wouldn't be able to take up enough chain? Could be--I don't have much experience trying to run these kinds of ratios. I run XT compact (I think it's 22-32-44) and a 11-28 with a short cage XTR rear der on my mtb--I hate the general sloppyness on the long cage rear ders.
can you turn it up to 11?flyweight
Sep 4, 2003 10:20 AM
The problem would be getting a front derailleur adjusted to shift across a triple with a 56t outer and a 30t inner. Put the front derailleur high enough to shift up to the 56t front and it will be too high to drop the chain down to the 30t granny ring. Shifting across just a 56x42 double wouldn't be too difficult but adding in the third 30t chainring will probably not work. Doubt you'd have any problems on the back end of the bike.
can you turn it up to 11?ibasnazy1
Sep 5, 2003 6:22 AM
I am not opposed to changing all three rings to satisfy what would be considered a good match. In fact, I'm considering Salsa Pro's 38/46/56 setup. Does anyone have an opinion on these rings (quality, durability, shifting, etc)?

I've pieced together the cassette and now have it at 11-23 v.s. the 12-25 original. That did help quite a bit and was a great suggestion.

I think if I had to do it all over again, I would have waited and gotten a 2003 model Vision R65 with 26" wheels. The extra 2" would have made a big difference in the gear inch layout but right now this is what I have to work with.
salsa ringsoff roadie
Sep 5, 2003 2:16 PM
I'm not aquainted with that specific model, but in general Salsa rings are pretty dang nice. The rings I got for my MTB shift just fine, although I do NOT use index shifting on the front, and I don't think these specific are ramped / pinned. I'd imagine that if you are buying a road set like that, they would be ramped and pinned for index shifting, but you may want to check if that's an issue for you.
re: signed: Stuck in high gearibasnazy1
Sep 3, 2003 2:11 PM
Let me clarify. The Vision R65 is a SWB recumbent. The crankset is way out front so there's no problem with the chain. I'm running a 9-speed (12-25) Ultegra cassette.
The 24" wheels is the reason.Chen2
Sep 3, 2003 2:52 PM
The 24" wheels explain how you can spin out the 52 ring. I think an 11 cog is the answer, maybe just change the 12 to an 11 with new 11 lock ring, leave the rest of the cassette as is. I think you could have shifting problems if you mess with the triple crank set.