the rear tyres on my series 1 rub all the time with rear passengers even if there is just one it is standard height and standard rims cant see much damage to the tyres so its just the edge that's hitting could it be the choice of tyres they are yoko prada 2 195/50/15 don't remember it happening with the toyo proxys could the tyres be slightly more bulky also the front passenger side rubs on the inner arch thought it was the rack being out as on side had 3/4 turn mor than the other so re centred it but it still doing it

 

Are your shocks gone?

 

no they are new

 

What do the rub in the arch or the shock? It's gotta be width of the tyre, are the Extra Load rated or run flats they tend to be bigger? I'm measure the width of the tyre then get a comparison off someone with a different tyre

 

My S1 RST is lowered and even when one of the rear shocks was blown with positive camber on the rear wheels they never caught the arches. Now that the car is on Nankang NS-2Rs (a track based compound, thus the tyre is wider like other track biased tyres like the Toyo R1Rs, Yoko A008Rs, Federal 595RSRs) I did have an issue up front for different reasons but the rears despite running closer to the arch are still fine. The rear does now have a little more negative camber after some fault finding which would help matters, but despite the extra width the tyres do not catch.

What shocks have you fitted, and how did you install them (I.e, did you have the spring pan jacked up when you fitted the shocks into the place or the floor)? What shape are the plastic arches in and are they fitted well? The top damper hole where it goes onto the stub axles of my Ledas are elongated, meaning that when they were fitted via having a jack under the spring pan, they always went to positive camber ; the builder of the car made this mistake and I almost did.

It is unlikely to be the issue but it is possible. Without seeing the car in the flesh and checking things I am struggling to think of what else it could be bar:

severe toeing out making the wheels catch somehow (I doubt this strongly!)
worn bushes causing the wheel to be sticking out
stub axle holes in the dampers drilled out incorrectly

Here is how mine sits and how wide the tyres are. As said before I changed the front, the fronts almost always caught the arches upon going over a speed bump.

 

the top outside edge of the tyre is hitting the lip of the rear arch you can just make it out on the tyre where it hitting as its not like there is a groove formed in the tyre I have a different yoko on my spare and the walls on that don't bulge out as much I would go back to the same tyres as before but just cant remember when it actually started happening the springs where fitted with the floor jacked up and it has neg camber at rear

 

Maybe my rear arches have been trimmed. If you wish I can measure my rear arches in various places .