Now we are making some progress. Thanks folks! I used the average of the two reported measurements for the OEM pulley (i.e. average = 122 mm). That can easily be changed once some one gets a caliper on it. You could also wrap it with a non stretchy piece of plastic or tape and then unwrap and use diameter = circumference/pi. That should be quite accurate.
Come on vendors, let's see some more measurements!
E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK |
| Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors |
| Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels |
| XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit |