craigbunnell
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| posted on 22/5/07 at 08:07 AM |
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Different Front/rear tyres??
Hi Guys,
ive recently had big excursion into hedge when spinning my new (2week) tiger coming of roundabout onto slip road in heavy rain, as part of getting car
back on the road, I was thinking of changing tyres (i want to use car year round wet & dry) currently got champiro 40 on rear and yoko avs on
front, question is it best to replace all four with new tyres or just replace say the rears? after reading the archives im thinking eagle f1 or toyo
T1-r any opinions most appreciated!
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graememk
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| posted on 22/5/07 at 08:15 AM |
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what psi do you run in your tyres
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craigbunnell
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| posted on 22/5/07 at 08:18 AM |
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18 psi all round, is that correct?
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locoR1
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| posted on 22/5/07 at 08:41 AM |
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quote:
Originally posted by craigbunnell
18 psi all round, is that correct?
Sounds about right to me but I would say that I run 18psi as well
 
Description
Check out my CB500T Cafe Racer build diary
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craigbunnell
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| posted on 22/5/07 at 09:14 AM |
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I know ive read the reviews of champiro (crap!), im just not sure whether i need to replace just the rears or all four?
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britishtrident
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| posted on 22/5/07 at 10:08 AM |
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One reason for changing all four tyres is that you want the consistent front/rear balance wet or dry.
One tyre can be great in the dry but have much higher slip angles in the wet compared to an other tyre which behaves identically performance wise in
the dry.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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mad4x4
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| posted on 22/5/07 at 11:38 AM |
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What is the rear suspension set up - If you have to much negative camber (wheel in at top) the vehicle will be tail happy in the wet.
One suggesttion would be to also SLOW DOWN when it's raining. Speed always is the biggest factor in a spin!
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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craigbunnell
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| posted on 22/5/07 at 11:50 AM |
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i haven't got alot of camber, was in 3rd gear moderately accelerating up slip road the back end went one way so foot of accelerator and steered
into it, it straightened up then went the over way ended up slowly sliding on grass into hedge. im very wary in the wet but I dont have any confidence
in whether its going to be safe or not..... thats why im thinking of better tyres probably toyo t1-r
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britishtrident
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| posted on 22/5/07 at 05:31 PM |
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Snap over steer in the wet is the hall mark of the type of rear suspension on your car just ask any owner of old BMWs.
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David Jenkins
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| posted on 22/5/07 at 05:35 PM |
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I have a matching set of tyres in very good condition... and the car's still 'interesting' in the wet. Slightest bit of excess
throttle and the back end wants to go in front... 
All part of the joys of a traditional rear-wheel drive car!
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britishtrident
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| posted on 22/5/07 at 06:34 PM |
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With rear semi-trailling arms the back must be set up with quite a lot of toe-in to get them to be predictable.
They also need some negative camber.
On the Imp racers we ran 3/16" to 5/16" (over both wheels)
-0.5 to -1 degree negative camber.
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craigbunnell
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| posted on 22/5/07 at 09:28 PM |
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hi,
thanks for the replys, i dont really have any knowledge when it comes to setting up the car, so think i need to do some reading to figure out what i
can and should do.......
on the up side found toyo t1-r 205/40/17 x 4 for 232 quid.
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