I was coming round to the idea of using spacers to get the Ultralites to fit.
I had worked out I had 3mm track each side to work with to keep it to the same total track width as the PFF-7's, and prevent any more arch clearance issues.
However, I have just confirmed they have to go after a little trial this evening with a handfull of washers.
To clear the Brembo's by 2.5mm I needed a 9mm shim with the Ultralites.
The hub centre bore is only approx 10mm, so the wheel would be sitting on 1mm of hub. Therefore hubcentric spacers with an extended centre bore and longer studs would be required.
This is then getting silly and already 6mm over my desired track width.
Comparing to the PFF-7's
Without shims the PFF-7's clear the Brembo's by 11mm.
So in total the difference in clearance between an Ultralite (7.5" ET48) and PFF-7 (8" ET51) is 17.5mm which is quite shocking.
It just goes to show how important a wheel style is when selecting an offset.
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