Alfa Romeo Forum banner

1 - 3 of 3 Posts

·
Registered
Joined
·
73 Posts
Discussion Starter #1
Hi guys.

Buying new tyres for the Alfa (picking the rims up from powdercoating tomorrow!) and had a question. The rims are 18" and the tyres on previously were 225/40-18 however when the car had a bit of load in it the tyre would rub against the plastic arch on the rear when going over bumps. Should I stick to 225/40 or would it maybe be better to go for 225/35 instead?

Cheers
 

·
Registered
Joined
·
30,019 Posts
225/40R18 are only 3mm bigger in diameter than the std 225/45R17, so clearance has only changed by 1.5mm

In contrast, 225/35R18 are 19mm smaller than the std 225/45R17 but still 4mm bigger than the std 16" 205/50R16

What is the offset of your 18" rims?
 

·
Registered
Joined
·
2,674 Posts
On one of my V6s I run 8J 18s with 225/40s & Eibach -20mm springs + early style TS rear bumpstops. ET is -40 with 12mm hubcentric spacers & no clearance problems but with 16mm spacers it rubbed.

If the OP's wheels' ET is -35** then I would suspect worn/soft rear shocks + broken or no bumpstops.

**I only used this as a usual figure for aftermarket wheels but anywhere between -40 & -22 should give clearance ok.

I've just advised another V6 owner to junk his rear Konis for new std spec shocks(he bought Monroe as KYB weren't immediately available) & it cured his rubbing problem...17" Teles, Eibachs & no bumpstops. He's very happy with the Monroes & was about to change the whole rear suspension set up(suspecting the springs as everyone thinks Konis last forever:rolleyes:) before I suggested trying just the shocks as a cheap 'temporary' cure.

Here's a rather long winded post I did earlier in another thread: http://www.alfaowner.com/Forum/alfa-gtv-and-916-spider/388618-some-advice-please-on-hubcentric-spacers-for-rear.html#post5469578

Clive
 
1 - 3 of 3 Posts
Top