[qayaq_alaska]

DMS
Derailleurless Multi-Speed

Surly Pugsley Framset



Phil Cassette Hub
Paul Tensioner
Surly SS Cog / 22t



Surly Whirly Crankset
Surly and Salsa Rings
22t / 30t / 33t



3 Speed Manual Transmission...Simple
Two Main Gear Ratios: 39.5 / 43.5 gearinches
Bailout Gear Ratio: 29.0 gearinches



And if you're really good...you can shift with a flick of the toe!

_

 

[bhc]

I am running a two speed that way. I can "down shift" with a flick of the toe, can you shift up with your foot yet?

 

[grantheppes]

Does it not jump from not having a good chainline?

 

[SSSasky]

Looks like you could take ssome chain out. The tensioner still appears to be wrapping up a lot of slack in what should be your tightest chain choice.

Interesting set up, but I always wonder why people go that route instead of a simple-speed rear wtih friction shifting. The Melvin weighs/costs/looks the same as a derailleur setup, plus you end up with the triple rings up front ...

 

[qayaq_alaska]

Np

Using a 1/8 Wipperman Connex chain...not having any problems.

ML

Does it not jump from not having a good chainline?

 

[qayaq_alaska]

Why? Simple!

SS,

Good observation...did shorten the chain, ~ 1in, mo betta. Also upgraded the Melvin with better bearing cassette pulleys (appropriately winter greased)...worthwhile!

Wonder Why?

1) This bike is primarily used for expedition style riding in SW Alaska...400 miles off the 'road system'. Terrane is mild...mostly flat out on frozen 'long river', unabated treeless tundra trails, beach and frozen sea ice....pretty much flat so, don't really need a broad range of gears.

2) Weather and trail conditions here are fairly radical...just the other day at -10dF I found myself wading through knee deep overflow (yeah, 10 below and water)...a day later it was blowing thick wet sleet and rain...variable, wet, icing, freeze-thaw, blowing silt and sand all raise havoc with complicated cables shifters derailleurs etal... less complicated minimalist is a merely a commonsense solution, simple is survival.

3) Whynot?

I could go on...read: KISS (thats simple, not single).....all principles apply!



:thumbsup:

ML

Looks like you could take ssome chain out. The tensioner still appears to be wrapping up a lot of slack in what should be your tightest chain choice.

Interesting set up, but I always wonder why people go that route instead of a simple-speed rear wtih friction shifting. The Melvin weighs/costs/looks the same as a derailleur setup, plus you end up with the triple rings up front ...[/QUOT