Tyre clearance

[digger200]

Can anyone tell me what minimum clearance I could get away with between the sides of a road trailer tyre and a frame. I have always worked with 25mm.
Thanks

 

[Artisi]

Sufficient so the tyre doesn't rub

I would guess that 25mm would be a reasonable minimum allowing for a bit of sway etc in the suspension.

 

[patprimmer]

It depends a lot on the suspension. With a tight suspension with little toe change and good lateral location, 1" should be OK.

With dual axles, load sharing loose bushes and long travel, 50mm might be required.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[panelman]

I have a bog standard (=bone stock for our colonial cousins) B5 Audi S4 and I can’t get a small finger between the tyre and the suspension upright so clearance is about 10mm

 

[patprimmer]

Most trailers have primitive suspension with poor axle location. I suspect your Audi has a somewhat better suspension with accurate axle location.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[GregLocock]

That's probably 3mm tolerances and 7mm tire growth.

The tire to frame clearance also needs to include lateral compliance of the suspension and a much bigger tolerance stack, 25 sounds good to me.



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[digger200]

Thanks Guys