AT10 belt question

The AT10 belt in the primary drive of my bike was fitted about 10 years ago.
Although the belt still looks as new, it causes me now some concern.
What is the expected lifespan of these belts ? Will it still be ok, or shal I replace it just to be safe.

You are concerned, so fit a new one.

It’s an easy job.

take comfort in the service intervalof modern cars and their timing belts - 10 yrs o " X " number of miles ---- it is a serivice item

20-25000 miles I would expect.

Car timing belts are only transmitting enough force to lift and close the valves and not the full HP of the engine. They are typically changed at 60k miles or 6 years so 20 to 25K miles or 6 years would be a good guide.

The Tony Haywood belts on my T160 would regularly shred at around 6000 to 8000 miles so i fitted a Norman Hyde belt which outlasted the ownership of the bike

AT10 belts are of polyurethane construction and usually not used on road going vehicle engines to transmit power to the rear wheels. The Continental Gen III Synchroflex (red) version of the AT10 belt is supposed to last longer than the earlier grey or white belts. If you are not putting a lot of miles on it and it is optimally adjusted it could last longer.

I have a 25mm wide Gen III belt and it puts up with some street abuse. I've lost track of time, but it is probably only 3 or 4 years old.

I have no clue how long AT10 belts last driving a Norton clutch and transmitting power to the rear hub. Some guys here have had them for years on race bikes that see way more abuse than a street bike does.

Replace it if it'll make you feel better. Bolton Engineering carries the AT10 Continental Gen III belts. Not cheap though.

10 years might seem a long time but it also depends on how many mile you done in them 10 years as well the seasons that you ride in, if the bike is ridden everyday then might be a good reason to change the belt and throw that one as a spare, but if the miles are still only low keep using it and check on it when you do any maintenance/servicing as you should.

Ashley