advice on rear derailleur upgrade

[Sue Reinert]

Friends, I have a 2018 Pocket Llama, has the original Shimano Altus 310 rear derailleur. Cassette is 18-32 8 spd. The derailleur needs to be replaced; I'd appreciate suggestions on an upgrade with a short cage that would work with this configuration. The front chainrings are 48-38-28. Thanks for any ideas.

[Ken Preston]

I’ve replaced my Crusoe with Microshift products. Lots of options but sometimes hard to get. 

Ken

On Jul 26, 2024, at 11:25 AM, Sue Reinert <reine...@gmail.com> wrote:

Friends, I have a 2018 Pocket Llama, has the original Shimano Altus 310 rear derailleur. Cassette is 18-32 8 spd. The derailleur needs to be replaced; I'd appreciate suggestions on an upgrade with a short cage that would work with this configuration. The front chainrings are 48-38-28. Thanks for any ideas.

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[Sue Reinert]

Thanks, Ken.

[Rick Mason]

you said you have a 18-32 cassette. Did you mean 13-32?  An 18 tooth small cog with a 48 tooth large ring would spin out at about 14 MPH!

I ask because 48 t0 28 up front, and 18-32 ibn back is only 34 teeth total range. Most short cage derailleurs will work with that. But if you really have a 13-32 cassette as I suspect, that's 39 teeth. Very few, if any short cage derailleurs will work with that.

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[Sue Reinert]

Sorry, my mistake, it's 11-32. I wonder if I should just replace the worn out Altus with a new one.

[Geof Gee]

Glad you asked Rick!

In Shimano speak, you have SS, GS, and SGS designations which I'll call short, medium and long. Look for a mountain bike GS rear derailleur compatible with your 8-speed shifters, then it will also be optimized for your size cassette.  

-Geof 

Arlington, VA  

On Fri, Jul 26, 2024 at 2:25 PM Rick Mason <rick.a...@gmail.com> wrote:

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[Geof Gee]

On Fri, Jul 26, 2024 at 9:48 PM Geof Gee <geo...@gmail.com> wrote:

Glad you asked Rick!

In Shimano speak, you have SS, GS, and SGS designations which I'll call short, medium and long. Look for a mountain bike GS rear derailleur compatible with your 8-speed shifters, then it will also be optimized for your size cassette.  

-Geof 

Arlington, VA  

On Fri, Jul 26, 2024 at 2:25 PM Rick Mason <rick.a...@gmail.com> wrote:

Most short cage derailleurs will work with that. But if you really have a 13-32 cassette as I suspect, that's 39 teeth. Very few, if any short cage derailleurs will work with that.

Oh ... I'll add that Rick's intuition is completely inline with mine. Assuming you're like a lot of modern cyclists who cross chain a lot -- "cross chain" means use the biggest chainring with the biggest rear cog or smallest chainring with smallest cog -- it's important to pay attention to the rear derailleur's capacity.  If you're confident you won't cross chain, then you can push the capacity constraints.  

https://www.sheldonbrown.com/harris/derailers-rear.html

https://www.mantel.com/uk/blog/derailleur-capacity-maximum-techcenter

-G

Arlington, VA

[David Dillard]

microSHIFT Advent "Super Short" Flatbar Groupset, 9spd – Velo Orange (velo-orange.com)

You all might find this interesting.  

David Dillard

Louisville

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