A Very British Klunker

[yakboy]

Lovely job sir

Cheers...any idea's on the chain tension?

 

[raidan73]

Cheers...any idea's on the chain tension?

What's the issue exactly? Can the rear mech not pick up the slack due to the wide ratio?

 

[Nabeaquam]

View attachment 939670

Bike all cabled up. Lot's of tweaking to be done. Main issue is chain tension on the smallest cogs. I think I may be able to loose a few more links but will probably need to fashion some sort of chain tensioner,any ideas? And remember it's got to be done in the spirit of what was hanging around in the late 70's, early 80's in the UK...I can't cheat

Loose links. I always take a link from the chain of a new mountain bike. Only way they shift right. I think the length formula is a ballpark estimate and many times wrong.

 

[yakboy]

What's the issue exactly? Can the rear mech not pick up the slack due to the wide ratio?

It's a very wide ratio. I could probably take out another couple of links but it will be very tight on the largest cogs ( the suntour mech is not exactly a long cage)

 

[doctor-bond]

Very cool. If you work on the basis that only the middle chainring does the full range of the freewheel does that help? Also what’s the rear mech: think I’ve got a suntour cyclone GT that can wrap 34t somewhere.

 

[TZEDS]

I know they fitted short cage Shimano 600 Road mechs to the early Marin Clunkers.To me that chain looks at the limit,if not beyond

 

[yakboy]

I think it is on the limit too. Hence trying to come up with some sort of chain tensioner. I'm trying to be faithful in my problem solving to the late 70's. From Alam Bond's pages everybody seemed to go about things in their own way and that's what I'm trying to recreate

 

[TZEDS]

Ah.. on closer inspection,ypu have the chain on the lowest gear on the rear.And the 600 mech,might have just fitted to Gary Fishers bike.