If the tensioners purpose is to to allow enough chain slack for use with long travel suspension, why aren't they fitted to MX and enduro bikes?

Because they use a different style, the chain guided onto the sprocket with a bulky guide that would be forever smashing into things on a trials bike

A trials bikes tensioner is generally fairly close to the pivot of the swingarm which offers a degree of protection to it.

The difference in length of swingarms may also play a part 

location of gearbox sprocket seems different?

I think the tensioner has a slider block because in a pinch I can make one out of Teflon.

(I used a router for the machining, I a little bit redneck)

 

Pieces

 

Finished block

 

Edited November 21, 20169 yr by zippy

A router is flash. I use a hacksaw

A hacksaw is just showing off, I just use my teeth.

Most MX and Enduro bikes don't get hurtled into the air at rocks and boulders with faster suspension compression and rebound settings... I could guess this typical trials type riding might have some connection to lack of tensioner?

I don't claim the above is correct but might be a contributing factor?

Edited November 21, 20169 yr by jonnyc21

Ta for your views and info about guide/tensioner arrangements on the trials/mx bikes.

It may be because the slide type is more compact, (look at how far a roller hangs below the chain) and lighter.

Also no moving parts means less maintenance. Cheaper to make.and lighter,(weight being very important in this sport).

It may be because the slide type is more compact, (look at how far a roller hangs below the chain) and lighter.

Also no moving parts means less maintenance. Cheaper to make.and lighter,(weight being very important in this sport).

 

 

Cheaper being very importanter in this sport............