Topic: One for the machinists

[simon#42]

hi brent
for me 5mm is the absolute minimum i would go to , normally i used 6 mm  and still managed to banana at least two sets a season [ and i am by no means the last of the late brakers ]  . my worry with your discs would be if they moved again after they had gone through a couple of heat cycles [ although im surprised you felt any pulsing at all with only 5 thou run out ]
take a spare set with you ...... just in case

[bwaller]

Simon, I'm not sure what you raced but TZ's I believe. This is a street based outfit & I'll only be braking from 50mph so hopefully they'll be ok. 

There is a difference between disc "variable width" & runout. Runout was minimal and to me wasn't the issue.

I'll for sure let everyone know how they turn out.

[simon#42]

looking forward to the race reports , make sure you put loads of pictures in for TG !

[bwaller]

Not to drag this out, but thought I would provide an update. Chris Shumann stepped up, re-ground these discs and had them back to me in a couple days, no charge. Great job Chris, thanks.

This solved the pulsing problem, the brakes are strong.... up front at least.

[FunJimmy]

Great news Brent.
Now get some track time in before the race. 

[turboguzzi]

neat 

[754]

 Well I tried sanding my disc today.
 I did it on the bike.
 I tried mesuring runout but the front end was noving around and I could not get a accurate reading.
 Miked the disc on every spoke and noted mesurement, ad about 1.5 ish difference. Caliper is also dragging on high spot.
 I sanded it with 100grit on a drywall sanding pad. The discs are hard, 10- grit looked pretty smooth, could use coarser grit, be faster.
 Anyway took a bit under an hour to get a third of the disc down about a thou. still dragging a tad, but what a world of difference.
 Well I got to say it was worth it, and would take half that time with a coarser grit and having the wheel off so you can press harder.