Hub bore machining (Page 1/1) Ncfiero AUG 12, 03:11 PM Bought an old set of Rota wheels cheap but they had a 56.1 mm hub bore. After surfing around for info on how to open them up to the Fiero’s 57.1 mm and not finding any info of much use and not wanting to spend $200 at a machine shop, I came up with a method to do them myself. Started with a 1 inch 5x100 to 5x100 spacer with a 57.1 mm bore Using a flush trim top bearing router bit, I cut off the lip to make it a constant 57.1 bore. Bolted it up to the wheel and using the router again, machined the wheel itself And now the wheels all have a 57.1 mm bore in about 20 minutes of time and $50 for the spacer and router bit pmbrunelle AUG 12, 06:20 PM It's a good method. Thanks for sharing. I'm always amazed at how cheap you can get things in the USA. Last time I bought a flush-cut router bit (Freud) from Amazon, it was $55.94 + tax. Wheel spacer (probably have to buy a pair, if not four) would probably be another $150. Raydar AUG 12, 06:28 PM Excellent! Great info. I've taken a "pass" on at least one set of wheels, due to the 1 mm undersize centerbore. Ncfiero AUG 13, 08:21 AM quote Originally posted by pmbrunelle: It's a good method. Thanks for sharing. I'm always amazed at how cheap you can get things in the USA. Last time I bought a flush-cut router bit (Freud) from Amazon, it was $55.94 + tax. Wheel spacer (probably have to buy a pair, if not four) would probably be another $150. That’s a big difference, the set of four router bits was $17 and the pair of spacers was $34, both from Amazon