Front caliper clearance

[GreggT]

This is not necessarily a 997.2 question.....really for any recent-year Pcar, but I'll ask it here since it does involve winter fitments for a new 09 C4s.

I am testing use of winter fitments that I have used on 2001 Turbo and on a 2002 C4 .... and finding that the front calipers on the new C4s sit 'out' further into the wheel than in the past (this explains the slight dif in spoke lay-out, front vs rear, on the new Carrera SII wheels, that close observation reveals).

These winter wheels clear the outside surface of the C4s front red calipers, but just barely....less than 1/8" between the outside surface of the caliper casing and the inside surface of a wheel (spokes). I would just a soon not add a small spacer to push the wheel out.

I should know more about front suspension movement & geometry but, is less than 1/8" enough?.....i.e. with suspension travel and normal bumps & jumps, does the position of the caliper move at all relative to that inside wheel surface?.....or do they always move perfectly together.

In other words, if the wheels 'clear' the calipers while she's sitting up on jacks in my garage......will they always clear going down the road?

Thanks in advance for any input.

[RFM]

Caliper, rotor, hub and wheel "moves perfectly together" as you stated, there should be no difference in theory. 1/8" is not that much, in case of road debris enters between the caliper and the inner side of the wheel, and what with the wheel balance weight ?

[GreggT]

Caliper, rotor, hub and wheel "moves perfectly together" as you stated, there should be no difference in theory. 1/8" is not that much, in case of road debris enters between the caliper and the inner side of the wheel, and what with the wheel balance weight ?

Wheel balance weights would be on the 'rim' (inside of the barrel).

The "less than 1/8" I'm talking about is between the flat outer surface of the caliper and the inside of the wheel spokes or wheel centers.