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Old 03-06-2015, 11:02 AM
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Default Trike tyres question..

My Spyder is fitted with a car tyre on the rear.

What is the minimum tread depth required for an MoT on a trike wearing car tyres?

Cheers..
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Old 03-06-2015, 02:35 PM
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That's one of those BIIIIIG questions that can reaqlly only be answered by an MOT man - there are a couple on here so maybe they'll be long in in minute!
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Old 03-06-2015, 05:35 PM
ironmike953 ironmike953 is offline
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1.6mm is the minimum, or it was. If its 2mm or less I would change. Brakes and tyres are the two things NOT to skimp on.
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Old 03-06-2015, 06:37 PM
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If the trike is over 410 kg unladen weight it needs 1.6mm
Same as a car


Below that its 1mm according to the class iii manual.
Same as a bike

https://www.gov.uk/government/upload...7-vehicles.pdf
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Old 03-06-2015, 08:10 PM
markju markju is offline
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Quote:
Originally Posted by harry View Post
If the trike is over 410 kg unladen weight it needs 1.6mm
Same as a car


Below that its 1mm according to the class iii manual.
Same as a bike

https://www.gov.uk/government/upload...7-vehicles.pdf
Now that's interesting. Thought they would've been the same, 1.6mm minimum.
As already said best not too skimp. Think I will change the bike tyre on my trike well before it hit the 1.0 mark.
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Old 03-06-2015, 09:00 PM
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When the legal minimum tread depth came in everything was 1mm except mopeds which had to have "visible tread".

Research into aquaplaning led to an increase to 1.6mm for cars and vans but not bikes HGV or busses.

It was discovered that the high ground pressure of heavy vehicles on a small contact patch was sufficient to squeeze water out from under truck tyres.
This leads to some strange anomolies where a transit van needs 1.6mm but stick enough seats in it to make it a coach and it only needs 1mm.

Bike tyres behave differently because of the shape of the contact patch which is like a canoe profile. This itself clears water so the legal minimum reflects this.

But the legal minimum is decided by vehicle class not tyre type so we get these anomolies.

All this is minimum standards and I wouldn't let any of my tyres get this worn.
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Old 04-06-2015, 07:35 AM
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I was asking because the tyre is getting close to the TWI, I want it tested but I am planning to change the tyres toward the end of summer anyway.

Thanks for the help guys and thanks Harry for a definitive answer.
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