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Belt Drive / Re: Belt drive article from Thorn Blog

« Last post by JohnR on Today at 05:30:11 PM »

A big minus of the belt drive system is the cost of changing the overall gearing ratio which needs replacement of two of the three drivetrain components.

And belts need to be kept clean to ensure optimum performance. I had a belt drive bike some years ago and rode it through a winter. I spent a lot of time trying, unsuccessfully, to identify the source of creaks. When spring arrived I gave the bike, including the belt, a good clean. The creaks disappeared.

General Technical / Sherpa dimensions?

« Last post by steveparry on Today at 03:12:32 PM »

I have a Sherpa Mark 1 - I think see photos in the For sale section. I know it's a 535L. Does that signify the frame dimension ie one of the tubes is 535mm long? Also does anyone have a link to an old catalogue that describes this bike? I guess the mark 1 was made around 2005 - 2010? Thanks.

Bikes For Sale / Re: Sherpa Wanted

« Last post by steveparry on Today at 02:37:31 PM »

See my ad just reposted above.

Bikes For Sale / Re: Sherpa 535L

« Last post by steveparry on Today at 02:36:20 PM »

Still available.

Non-Thorn Related / MOVED: Gates Drive

« Last post by Danneaux on February 23, 2026, 05:17:00 PM »

This topic has been moved to Belt Drive.

https://thorncyclesforum.co.uk/index.php?topic=10429.0

Rohloff Internal Hub Gears / MOVED: Removing Gates threaded Sprocket

« Last post by Danneaux on February 23, 2026, 05:16:12 PM »

This topic has been moved to Belt Drive.

https://thorncyclesforum.co.uk/index.php?topic=13850.0

Belt Drive / Re: Belt drive article from Thorn Blog

« Last post by Tiberius on February 23, 2026, 10:58:21 AM »

A quick heads up for anyone running a belt drive.

SJS are currently running an offer on SOME belts - I've just bought a 113T for half RRP.

Transmission / eBike Motor Reliability

« Last post by Danneaux on February 22, 2026, 11:09:32 PM »

Hey All!

A valued member contacted me to suggest the following video "article" by Alee Denham on the reliability of eBike motors might be of interest to those considering either a conversion of their existing bikes or the purchase of a new eBike. After viewing the video -- and finding myself surprised at some of the reported data -- I thought I'd pass it on...

https://www.youtube.com/watch?v=xOZf0U1XsoE

Best, Dan.