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2x9 on a 575?

1203 Views 12 Replies 8 Participants Last post by  Tim Arnold
My XT 11-32 cassette has worn out and i like the look of the roadie shimano ultegra 12-27 cassette (cheaper and lighter).

I am after a lightweight set up using my XT cranks. I am thinking of using TA rings. Replacing my inner 22 with a 28 and my middle with a 40 or 42 and nothing on the outside.

Has anyone tried this on a 575? I am thinking that this set up would suit me as don't use my 22 ring on the chainset but could better usage of the gears going 12-27 at the back and 28/42 on the cranks. I have seen on other forums this done but not on a 575.

I guess clearance should b ok with a 28t ring as the inner?

Any thoughts or input would be great. Oh, i ride mainly XC stuff in the south of UK
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Sounds like a good idea. Try it out and post some pics.
Lots of folks run their 575 2x9, including me. Not with that gearing though, it would be pretty useless for my terrain. Just do it :thumbsup:
Running 2x9 on my BMC

I recently made te switch from the three ring set up to a set of Middleburn 2x9's (27/40) on my new BMC. I am actually running a 2 X 7 using a Shimano 13-34 megarange casstte, very light and very dependable. Try it an give it a couple of rides, I think you will be pleased with the choice. The Middleburn Cranks are awesome if you are interested, the system is great IMO. Good luck.

Happy Holidays!!!

MadDuc916
eatdrinkride said:
Lots of folks run their 575 2x9, including me. Not with that gearing though, it would be pretty useless for my terrain. Just do it :thumbsup:
Yeah I run 2x9, but with a 11-34 cassette and a 22/34 crankset.
I'll be running 29/40 and 11-32 on my 575 once my chainrings and crankset arrive.
I ran 2x9 on mine, with 32-42 in front and 11-32 back.
I can give you a comparison plot if you tell me what you have and what you want.
Hi agabriel, i was thinking of 28t in inner and 40 or 42 in middle running 12-27 cassette.

Would 27/28 be easier than32/32?

Cheers
2
Tim Arnold said:
Hi agabriel, i was thinking of 28t in inner and 40 or 42 in middle running 12-27 cassette.

Would 27/28 be easier than32/32?

Cheers
Got it, I'm going to throw up to graphics. One is the one you asked for and the other is typical MTB gearing as a comparison. One thing to keep in mind is the base MTB cassette has an 11T gear, the cassette your interested in has a 12T gear. What do you think now?

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Crickey, how did you do that?

According to the charts, i would not be getting as far or as fast with a 2x9 ratio that i am looking at. Is that correct?

I guess though it all depends on the terrain you are riding and the gradients of the hills.

Interesting.

Still think i will go down the 2x9 route. 42/28 - 12-27
So Forward Movement = wheel size * front ring / rear cog * pi - then you can divide it by 12 to get it into feet. With that said, your decreasing your gearing dynamic range but increasing your resolution between gears within that dynamic range.

Have you thought about a 44T big ring? A 44/28 gear combo might get you what your looking for, at least on paper.

Oh, I used Matlab to generate the plots.
I have ordered a 42t middle ring and a 28t inner. TA rings

I thought that the jump in ring size with a 44/28 might be too much and not sure on frame clearance. 42 may be pushing it!

Thanks for all your help everyone and Happy New Year.

I will report back when i have it all set up.

Cheers

Tim
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