Very ingenious design for this new tensioner developped by the UK manufacturer Heatsink.
New design: now with a pully wheel with carbon fiber supports.
The tension is applied by the 1 spring steel plate and the very resistant pully.
This tensioner is fully adjustable. It is mounted between the hub and the inside of the rear dropout.
Fits singlespeed and 6speeds hubs.
Weight: only 56g!
Note: for mounting, all you need is a 3mm allen key and 8mm spanner.
For optimal tension, do not bend too much the spring plates. Adjust tension to give them a curve as shown on the pictures.