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Hi.

Have 4 x 10mm Forge spacers ready to go on and just need to triple-check measurements with those of you running spacers with stock Avus wheels.

I understand that the standard OE bolt length with 18" Avus wheels on the B6 S4 is 14 x 1.5 x 28 therefore I require 14 x 1.5 x 38 bolts to work with 10mm spacers. Are my numbers correct for this application?

If so, then would I be OK using 14 x 1.5 x 40 bolts or do the bolts have to be spot on to the exact mm in order not to catch on anything?

This is probably all a bit school boy league but I just want to make sure I'm doing exactly the right thing for both car and occupants.

When you buy the bolts, if they are too long get 1 or 2 nuts for them as well, then you can put the nut on before cutting the bolt, then clean the threads when you take the bolt off.

If you test fit 2 bolts in the wheel to keep it steady, then slowly rotate the wheel and listen and feel for anything catching or that the bolt isn't bottoming out. Loads of people chew up ABS ring and sensors by not checking this. Then if they are too long, get cutting

Good advice once again, xyber, thanks man. Going to hazard an assumption that this approach would lend itself (the cutting) to a more at-home DIY job... or would you err on the side of caution and take the lot to a machine shop?

If it's only cutting a bolt down it's easy. Spin the nut on and position it so it guides the saw whilst cutting, little squirt of WD40 and off you go. Give a quick file if needed and spin the nut off. One perfectly cut bolt. I usual just use a normal hack saw with a fine toothed metal blade and clamp it in the vice. A machine shop would probably do the exact same thing to be honest, it's abit too small for power tools because generally your only nipping off a few threads.