OK, I've searched the site for info on this and found some interesting comments, and have looked at the SIDC faq.

General concensus is that tyres need to be either 205/45 or 215/40 to fit a classic impreza.

Would fitting 205/40/17 create a huge problem? Reason for asking is that I've been looking at a wheel/tyre package (Diablos + Toyo Proxies) but the tyres are the 205/40 size. I don;t want to spend money on something that is not going to work, but at the same time don;t want to discount this package if the only problem is a slight variation on the calibration of the speedo.

Is anyone out there running 205/40's on 17" rims at the moment? If so, have you noticed any problems?

Dave
www.scoobyphotos.com
dave@scoobyphotos.com

The rolling radius will be smaller so your speedo will be slightly out, also gearing will be affected. Toyo do tyres in 215/40/17 - I'd be tempted to go for the correct size even if it costs a bit more.

Hello Mate

iwas running 205/40/17 on 17inch rims

Apart from looking stretched onto rims, i found handling a bit wierd

Since Ive gone to 215/40/17 on 7x17 rims, they look far better, protect the rim better and handling has greatly inproved, albiet I did go from falkens se512's to goodyear f1's. Fantastic!!

Rob

Cheers Rob, thats just the sort of info needed - will be getting 215/40's I think, have to try and see who'll do the best deal on them!!

Dave
www.scoobyphotos.com
dave@scoobyphotos.com

im running 205/40/17's without any problems and the wheel size is the same as the original ones i took off

steve, what make of tyre is it you are using?

Just used http://classic2.alfisti.net/english/...eifendaten.htm to calculate the differences between my current tyre (205/50/16) with the following three possibilities (215/40/17 and 205/40/17 and 205/45/17)

against my original tyre size :
215/40/17 results in a -1.2km/h difference at 62km/h (1.92 mph)
205/40/17 results in a -2.6km/h difference at 62km/h (4.16 mph)
205/45/17 results in a 0.8km/h difference at 62km/h (1.28 mph)

This suggests that to keep as close a rolling radius as possible to my current tyres I need a 205/45/17.....

Gah, decisions decisions.

Dave
www.scoobyphotos.com
dave@scoobyphotos.com

[Edited by Dave_A - 12/26/2003 10:03:30 PM]

Edited cos I'm stupid !

Mark

[Edited by markwild - 12/28/2003 9:44:18 AM]