Belt drive conversion for Triumph Bonneville T120

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Description

Belt transmission primarily made to reduce “loss of power” between transmission box and rear wheel, over to eliminate completely maintenance (no cleaning, no greasing).

Fits on Triumph Bonneville T120.

61 teeth alloy pulley

27 teeth nickel plate pinion

126 teeth belt

The ratio is the same than the original one.

ATTENTION! This is Not a Bolt-in kit! Due to clearance reason it’s necessary to shave down a protrusion on the gearbox, see instruction on page 8 & 9 picture 13 & 14.

Kit is REVERSIBLE.

The OEM chain guard is not compatible with this kit, it can be replaced with the code FS-307516

Specifications

SKU

FS-307595K

Reviews

Worth the money? Yes!

4 February 2026
Love this conversion kit. It transformed my T120 Bonnie. No more oiling, no more really annoying, time-consuming chain adjustments and no more 'slack chain' performance when the chain is in need of adjustment. I've never been a fan of the limited engine braking on the T120 when decelerating but it seems to me at least that there is a little more resistance offered by the belt drive when rolling off the throttle. It's not engine braking but it does mean I don't have to brake quite so much before entering a tight corner on a downhill run. Having said that, I haven't noticed any decline in performance when on the throttle. Anyway, I'm a very happy customer and Lizzie made the process as easy as it could be given she was waiting for stock at the time.

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