175-60-13 tyres

[Shooter63]

Just wondered what people's thoughts were for going down to 175-60-13 tyres on the front as khumo don't do a 185-60, but they do a rear tyre in the size I'm looking to run 215-50-13 on a 8" rim

Shooter

[stylussprinter]

I run the same all round , let the geometry adjustment do the job of balance , corner weights etc . I have 7.5 x 13 wheels with 215 x 55 tyres AVON ZZR all round . Car weighs 570kgs so 14 psi all round . When she weighed 650kgs tyre pressures were 17 psi .
To answer your question directly , I wouldn't fit that size tyre even on a road car

[kevp]

Don't know about having a 175 on the front, but matched to a 215 rear may look like a hotrod. If you need the wide rears I would have thought the fronts should be only 1 size down.

[Shooter63]

I know what you mean, tyre wise it's a toss up between avon zzs and khumo v70, Avon zzs 185/55-13 front 215/55-13 rear ,the problem is getting the back end down low enough to match the front, I've a horrible feeling I'm going to have to buy new 12" dampers and springs

Shooter

[stylussprinter]

11 in dampers 7 in springs front -- 15 in dampers 9 in springs rear (8 in if track comp) These dampers will allow you to maintain piston travel in bump as you lower/adjust ride height/rake . The rear trailing arms need to be , either the original dipped arms or my own design , that allow the same 15 in damper , along with lowering/rake/ride height adjustment/piston travel in bump.
If you have Tim Benbow's orginal dipped trailing arms great but if not and you fit 12 in dampers to lower the car then at some point you will bend the trailing arms . WHY because a 12 in damper has much less piston length , hence dangerously little visible when the car is with driver/passenger , hard cornering etc . Pages have been written on here about this rather ancient problem with all SYLVA designed kits by myself .
PM me should you need lowering arms , it'll take a week to get a pair made/treated/painted , along with correct poly bushes with S Steel centres.

[Shooter63]

11 in dampers 7 in springs front -- 15 in dampers 9 in springs rear (8 in if track comp) These dampers will allow you to maintain piston travel in bump as you lower/adjust ride height/rake . The rear trailing arms need to be , either the original dipped arms or my own design , that allow the same 15 in damper , along with lowering/rake/ride height adjustment/piston travel in bump.
If you have Tim Benbow's orginal dipped trailing arms great but if not and you fit 12 in dampers to lower the car then at some point you will bend the trailing arms . WHY because a 12 in damper has much less piston length , hence dangerously little visible when the car is with driver/passenger , hard cornering etc . Pages have been written on here about this rather ancient problem with all SYLVA designed kits by myself .
PM me should you need lowering arms , it'll take a week to get a pair made/treated/painted , along with correct poly bushes with S Steel centres.

That's exactly what I have, I asked on here before buying and that's the answer you gave ( pro tech dampers from procomp correctly valved for a stylus ) I think the problem will be getting the back down ,the difference between the 185/55 front and 215/55 rear zzs is approx 30mm diameter which means bringing the rear down that amount or bringing the front up a bit etc to balance it out.
Since the original question I've decided to go with the Avon zzs

Shooter

[stylussprinter]

Why 185 's though It'll understeer under hard cornering

[Shooter63]

Why 185 's though It'll understeer under hard cornering

I think with over 300bhp and 300ftlb of torque on tap understeer will not be my major problem ,

Shooter

[kevp]

Why 185 's though It'll understeer under hard cornering

I think with over 300bhp and 300ftlb of torque on tap understeer will not be my major problem ,

Shooter

That's OK if your in command of the bends. If like me - there are a lot of blind bends on the road, you may often have to pull the front in quite swiftly. Good front end grip is very necessary.