Rich
Club Retro Rides Member
Posts: 6,256 
Club RR Member Number: 160
|
|
Oct 13, 2009 10:57:01 GMT
|
Ok, not the usual 'what R my tyres meant to be blown up2?'. I know that  I have fitted 15" wheels on the back of my 'bus with massive tractor style 235/75R15 tyres. What pressure should I be looking at running them at? I would imagine less than factory pressures as they have a much bigger footprint but I'm open to suggestions When I put the tyres on, I popped the bead on and shoved some air in, put them on the van then blew them up. One looked fine, but had 13PSI in. So I'm thinking a lot lower than factory.. Cheers, Rich |
| |
|
|
|
|
|
Oct 13, 2009 11:03:01 GMT
|
|
tractor style? for off road use? if you drop below about 12-15psi you risk the tyre becoming unseated from the rim, for soft ground drop 5 or10psi from the tyres first, if your still sinking then drop a bit more, but its best not to drop more than 50%
|
| |
Volvo back as my main squeeze, more boost and some interior goodies on the way.
|
|
Rich
Club Retro Rides Member
Posts: 6,256
Club RR Member Number: 160
|
|
Oct 13, 2009 11:13:58 GMT
|
No not for offroad, just because buying 15" steels and using these tires was cheaper than 2 new van tires. They are not really that aggresivly treaded. were not much use on my SJ anyway.. (too big I think ) |
| |
|
|
|
|
|
Oct 13, 2009 11:19:01 GMT
|
|
Even though they're 235s, I still wouldn't want to be running less than 25psi on the back of a VW van for road use. How is the bus normally loaded? Is it a heavy camper conversion, ferrying the whole football team, tradesman's tools or just an empty van? I'd say experiment and see what works best, but keep them somewhere between 25-40psi for road use, preferably towards the lower end of the scale.
|
| |
|
|
|
|
|
Oct 13, 2009 11:23:48 GMT
|
|
20 seems a bit low to me, i don't know VW vans specifically but unless they have some odd handling quirks i wouldn't run a car on less than 25 let alone a van, to much flex will just build up lots of heat, use up more petrol wear the edges of teh tyres out and not help cornering at all.
|
| |
Volvo back as my main squeeze, more boost and some interior goodies on the way.
|
|
|
|
|
Oct 13, 2009 11:26:05 GMT
|
|
Inflate to standard pressure as a good starting point. (unless the vehicle weight has changed?)
|
| |
|
|
Rich
Club Retro Rides Member
Posts: 6,256
Club RR Member Number: 160
|
|
Oct 13, 2009 12:01:35 GMT
|
ok. Vehicles is a 5 seat minibus so like a limo. Only has back seats, a sub, a box with oil and water in and me and the missus up front. Standard pressure is 3.7BAR but I think thats for a half loaded panel van. Got them at about 3.2 at the moment and they look and feel (from the ride) a bit hard. Might drop a little more and keep trying til it feels right and looks right  |
| |
|
|
