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I'll do it next time!
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Discussion Starter · #1 ·
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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EDR
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10,309 Posts
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:
 

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Mojo MadDuc
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123 Posts
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
 

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Bad Case of the Mondays
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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.
 

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I'll do it next time!
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119 Posts
Discussion Starter · #9 ·
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
 

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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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I'll do it next time!
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119 Posts
Discussion Starter · #11 ·
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
 

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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.
 

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I'll do it next time!
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119 Posts
Discussion Starter · #13 ·
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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