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Largest cassette on a 20" Dahon?

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Largest cassette on a 20" Dahon?

Old 11-03-22, 07:51 PM
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CrimsonEclipse
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Largest cassette on a 20" Dahon?

It's time for a new derailleur and I figured that while I'm at it, time for an upgrade from an 8 speed to a 10 speed cassette and new derailleur.

That said, what is the largest practical cassette that would work?

46T maybe 50T?
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Old 11-04-22, 02:15 AM
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Originally Posted by CrimsonEclipse View Post
It's time for a new derailleur and I figured that while I'm at it, time for an upgrade from an 8 speed to a 10 speed cassette and new derailleur.

That said, what is the largest practical cassette that would work?

46T maybe 50T?
The issue or limiting factor is not the cogset. The limiting factor is ground clearance for the RD. On 10-speed 406, you want something along the lines of Deore M6000 which is rated to 42t. That's what I run on my 406er. Here it is...




.
The other GS alternative is to jump to 11-speed with this job rated for 46t.

Last edited by Ron Damon; 11-04-22 at 02:28 AM.
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Old 11-04-22, 10:22 AM
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Originally Posted by CrimsonEclipse View Post
It's time for a new derailleur and I figured that while I'm at it, time for an upgrade from an 8 speed to a 10 speed cassette and new derailleur.

That said, what is the largest practical cassette that would work?

46T maybe 50T?
What gear-inch value are you trying to achieve?
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Old 11-04-22, 08:45 PM
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Originally Posted by Ron Damon View Post
The issue or limiting factor is not the cogset. The limiting factor is ground clearance for the RD. On 10-speed 406, you want something along the lines of Deore M6000 which is rated to 42t. That's what I run on my 406er. Here it is...




.
The other GS alternative is to jump to 11-speed with this job rated for 46t.
Is that a long or medium cage?
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Old 11-04-22, 09:00 PM
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Originally Posted by CrimsonEclipse View Post
Is that a long or medium cage?
Shimano nomenclature
  • SS: short cage
  • GS: medium cage
  • SGS: long cage
Once again, on 406 wheels you want no longer than GS.

In my locality the Shimano RD-M6000-GS part has become rather scarce. That's the one you want for 10-speed and 42t max. Grab one if you can. Were I building a 406er, I'd use that or move up to 11-speed with the Shimano RD-M7000-GS part, good for 46t. You wanna blow more coin, there's also the RD-M8000-GS part, good for 46t and 11-speed. Are you seeing the pattern?

Last edited by Ron Damon; 11-04-22 at 09:15 PM.
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Old 11-04-22, 10:52 PM
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I run up a 11-46T nine speed cassette on one of our Terns, using Microshift’s medium length Advent rear derailleur. With a 52T chain ring that gives me a 88”-21” range which works for my hilly city, but needs either additional links adding to a standard chain or an extra long one.
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Old 11-04-22, 11:02 PM
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Originally Posted by Reddleman View Post
I run up a 11-46T nine speed cassette on one of our Terns, using Microshift’s medium length Advent rear derailleur. With a 52T chain ring that gives me a 88”-21” range which works for my hilly city, but needs either additional links adding to a standard chain or an extra long one.
A straight-on image with the RD at its lowest position would be great.
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Old 11-04-22, 11:12 PM
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As requested, clearance appears similar to that of a Shimano GS rear mech.
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Old 11-04-22, 11:20 PM
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Originally Posted by Reddleman View Post

As requested, clearance appears similar to that of a Shimano GS rear mech.
Yeah...thanks...I think...🤔 That's not a good image, even worse than mine. Certainly insufficient to make any determination. Come on, Aotearoa!
​​
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Old 11-04-22, 11:26 PM
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Give me a day or so and I’ll take a better one
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Old 11-04-22, 11:48 PM
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Originally Posted by Reddleman View Post
Give me a day or so and I’ll take a better one
Great. Images like these. Close up and straight on two dimensions.
.
Shimano RD-M6000-GS, 53-406 tires


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Old 11-05-22, 03:54 AM
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Personnaly, if going off road, i would keep a short cage derailleur. I tried medium and the bottom pulley kept getting caught. With shimano current short cage (equivalent to 10yrs old medium cage), i run 36T without problem and 40T with the better derailleur.

if you are just using the bike on the road, medium is “ok” although in the British winter it is not great as the pulley get covered with mud, salts etc
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Old 11-05-22, 11:17 PM
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As requested…



For reference, tyres are 50-406 Schwalbe Big Apples. I agree with Fentuz, I wouldn’t go heavily off-road with this setup - for that, I would probably replace it with a 11-38T cassette, the Microshift Advent super short rear mech and a 46T chainring and forfeit anything higher than a 75” top end.

Last edited by Reddleman; 11-05-22 at 11:48 PM.
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Old 11-06-22, 10:52 AM
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Here are pictures of the Microshift Super short 8 speed on 20 inch wheels.


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Old 11-06-22, 02:13 PM
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Originally Posted by Reddleman View Post
As requested…



For reference, tyres are 50-406 Schwalbe Big Apples. I agree with Fentuz, I wouldn’t go heavily off-road with this setup - for that, I would probably replace it with a 11-38T cassette, the Microshift Advent super short rear mech and a 46T chainring and forfeit anything higher than a 75” top end.
i’m worse than that I run 11-40 with a 44
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Old 11-07-22, 06:18 PM
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Originally Posted by Fentuz View Post
i’m worse than that I run 11-40 with a 44
Now that you mention it, there’s a 11-42T cassette with a 44T chainring on our other Tern Link, also with Microshift Advent - I installed that combo on my wife’s bike back when 11-42T cassettes were the largest Microshift were making…
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Old 11-18-22, 06:51 PM
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So, the answer is 50T

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Old 11-19-22, 12:30 AM
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Man, my Origami Wasp was rocking a 58t + 11t-28t freewheel w/16" wheels, and I never had an issue. Enjoy that baby!!!
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Old 11-19-22, 10:22 AM
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I updated my response to say "58T",... My bad!
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Old 11-19-22, 02:24 PM
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Old 12-26-22, 09:33 PM
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RD's like those make the case for IGH's
I have several 20"s and lost an RD to a pothole and have bent a few over the years.
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Old 12-30-22, 07:19 PM
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I recently installed a 40t cassette on my bike with a Shimano 9050 Di2 derailleur system. Ground clearance isn’t great, but the gearing range is enough to get up the steepest climbs I can find in Tokyo.
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