635 tyre queries

Hi i m new at this game so bear with me if i sound like a muppet.

I ve got an 84 635 csi and it has metric sized colway tyres fitted. These are getting seriously worn so i after reading and hearing about the cost of replacement rubber i thought i d take the good advice from the forum and track down some normal wheels on ebay. Found some from a seven series in good nick and won them. All good

Trouble is they don t fit. I don t have the current size to hand but i guess its the standard. The new 7 series wheels are 235 x 60x16. They are a little taller than the incumbents and foul the strut.

Do i cut my losses and sell them on. Do i find some slightly smaller rubber for the rims or can i space them out slightly.

Any help and advice will be much appreciated

On this subject, although the tyres on my 6 are new, I am considering changing the wheels at a later date, maybe.  I have the E28 version 6, and would rather stay with BMW wheels if possible, thus keeping it looking standard.  Which model would fit the E28 6 please?  (preferably without too much aggro, if possible) 

Thanx muchly 

Offset

If you take a centre line in the wheel going down through the wheel. This would be 0 offset. An ofset of 20mm would indicate that the hub would sit 20mm closer into the car. Likewise a negative offset would make a wheel sit further away from the car. The offset is important as if it is to big ie in the case of an e36 which has about a 35mm offset the wheel would touch the strut. Likewise too little and the tyre might catch the arch.

Offset can be adjusted by the use of spacers, but you are limited to about 6mm before you go beyond the hub and you need to fit lengthened wheel bolts for safety.

Hubscentric rings are effectiverly very small spacers which add about 1.2mm to the hub and are fitted to the wheels to make up the difference on a later model wheel to a older car. They are usually available in plastic, but i have herd that they are now available in metal. Most wheel shops that deal with BMW's will have them and Euro's stocks them to.

Hope this clears things up

James

Horsetan Lucky... lucky... lucky... <CENSORED>[/QUOTE wrote: Thanks (I think). Got them from Motorforce in Sou

Thanks (I think). Got them from Motorforce in South Shields (my neck of the woods). They deal with lots of 2nd hand BMW wheels (all refurbished). Better quality than Alpina copies & cheaper than real Alpinas.

You're right Sohlman. However, there's so much space around the arches I was considering lowering the car but Munich Legends put me off the idea, makes the suspension a little over harsh (unless you're that way inclined).

255/40's have the same rolling radius as the TRX 240/45's so keeps the speedo happy.