2005 BMW M3 COMPETITION PACKAGE · E46 · VERIFIED ON SEP 4, 2026
Factory size is 225/40R19 front and 255/35R19 rear (663 mm rolling diameter). 7 alternates stay within 3 % of that diameter: 235/35R19, 225/45R18, 235/40R18, 245/40R18, 255/40R18 and more. Anything beyond 3 % changes the speedometer reading and the gearing.
Factory size is 225/40R19 front and 255/35R19 rear (663 mm rolling diameter).
| SIZE | DIAMETER | VS OE | VERDICT |
|---|---|---|---|
| 225/40R19 | 663 mm (26.1") | 0 % | within 3 % |
| 235/35R19 | 647 mm (25.5") | -2.3 % | within 3 % |
| 255/35R19 | 661 mm (26") | -0.2 % | within 3 % |
| 265/30R19 | 642 mm (25.3") | -3.2 % | over 3 % — speedo error |
| 225/45R18 | 660 mm (26") | -0.4 % | within 3 % |
| 235/40R18 | 645 mm (25.4") | -2.6 % | within 3 % |
| 245/40R18 | 653 mm (25.7") | -1.4 % | within 3 % |
| 255/40R18 | 661 mm (26") | -0.2 % | within 3 % |
| 265/35R18 | 643 mm (25.3") | -3 % | within 3 % |
| 275/35R18 | 650 mm (25.6") | -1.9 % | within 3 % |
Fitment is computed from published vehicle data and the retailer's listed sizes (catalog 2026-09-04-tirerack-d, verified on Sep 4, 2026). Prices are list prices on that date. Verify with your installer before you buy. Buy links may be affiliate links.