This is “normal”


Active Member
I have a brand new HD750 and it has had a horrible rattle and grinding noise since day one. it is so bad my daughter told me she can hear it while riding 100 yards behind me.

at first I thought it was the bottom bracket, but I finally traced it down to the rear disc. The disc is bent, not just warped but bent. Look at the video I posted especially around the 0:10-0:1 second mark, the disc is grinding against the caliper.

sent this video to Bikonit support and they told me this is “normal”.

Luckily I had another 203mm disc I bought for another bike, I swapped the disc and guess what, the rattle and grinding noise is gone.

Normal my arse.