Shimano Altus low range question

[John Bokman]

HI Rivsters.

I'm wondering if anyone has successfully shifted a 12-36 shimano 9-speed cassette with an Altus RD?

I currently have an altus, and like it well enough, but am using a 44x30, 11-32 8 speed.

The new setup would be a triple up front (48-34-24), and a 12-36. 

According to Shimano, the Altus only shifts up to a 34 cog.

Just wondering if any of you Rivsters have been able to shift lower than that?

I can hunt for another derailer if need be, but would much rather not. I don't like the looks of the one Riv sells (Shimano Deore 592) because it doesn't have the barrel adjuster. I guess  could potentially go to the Alvio, or the used market. I actually have a Deore something or other which does shift to 36, but it's R Rise, and I have never gotten used to the reverse movement. Drives me mad!

Thanks,

John

Portland OR

[J Imler]

I don't think you'll have any problem, especially if you use a Wolftooth Roadlink. May not even be necessary though. I think I got a 42t low gear using said setup, but that was an 8 speed.

[john Bokman]

Interesting…thanks for the link! I wonder how Shimano determines what one of their detailers is capable of shifting? In other words, if they believe a derailer (lets say its an Altus, for example) is good for up to a 36 low cog, maybe they say it’s only good for up to a 34 tooth low cog, to give themselves some “wiggle room”? I’ve heard for years that many different derailers can, potentially, shift lower than their stated limitations.

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[DavidP]

In my experience you can usually expect to go a bit above stated max cog. While the RD-M310 is rated to 34t, I would give it a go with a 36t.

I have a bike with a Deore M531 (rated to 34t) shifting a 9 speed 40t.

That said hangers can vary and if you find it's not quite there then a short hanger extension (road link or similar) will get you there.

-Dave

[john Bokman]

Thanks for the real world recommendation Dave!

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[Mackenzy Albright]

I switched wheelsets and forgot to switch out my 11-42 cassette and accidentally friction shifted my altus to 38-42 and it didn't explode. I think it has much more range than spec'd. I otherwise use 38/24 double with a 11-36 cassette normally. 

[Johnny Alien]

If we are talking about the cool looking big pulley Altus RD then I do indeed have that rigged up on my Clem L with an 11-36 9 speed rear. No roadlink used and no problems. Just works as-is. Not sure if it matters but I am 1x with this setup so no triple up front but it does shift a 9 up to 36.

[Doug H.]

I have the newer, smaller pulley version of the Altus on my Clem and just installed a 7 speed 11-36 cassette and it works fine. My 9 speed topped out at 34 that I had on there stock.

Doug

[john Bokman]

Thanks everyone for your comments.

Doug I didn’t know that there were different versions of the Altus?  I think I have the large pulley. 

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[Kim Hetzel]

I found this picture from a Rivendell customer's bike in Rivendell's blog ?  Needless to say, I was quite amazed to see the capacity and potential at the same time. This could very well branch out into lengthy conversations between members herein.

Enjoy !

Kim Hetzel

Yelm, WA.

[dougP]

Just another confirmation that the large pulley Altus that Rivendell carries will handle an 11-36 9 speed. I have this on my Atlantis. Shimano always seems to be conservative in their ratings. It's on a triple with a 34 middle & I use the entire cassette on that ring. 44 outer is only used up to maybe the 3rd cog from the big, and the 24 inner out to maybe the 4th cog from the inner.

dougP

[john Bokman]

Thanks for the info Doug! This sounds exactly how I’d want to use my potential setup, and why I want to revert to 3X-land.

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