Front Disc Floating Rivets

[PJP1]

Afternoon all,

Just took the bike for its MOT, passed but I had an advisory saying "slight wear on front floating rivets"
Bike done 5500 miles, anyone had this and if so is it serious, do I need to replace them?

Never had this before, the movement seems very small to me

Thanks

[Antares]

Originally Posted by PJP1

Afternoon all,

Just took the bike for its MOT, passed but I had an advisory saying "slight wear on front floating rivets"
Bike done 5500 miles, anyone had this and if so is it serious, do I need to replace them?

Never had this before, the movement seems very small to me

Thanks

Sounds dumb, the disc is meant to move on the rivets. Lateral play is expected, as it has to move side to side on the rivets, there are little springs to keep it from rattling, but it also moves longitudinally a little bit, and that's completely normal. This can be excessive over time but has to be there since the rivets expand due to heat, if you have a nice riding session or just use brakes a couple times in a row you'll find this movement becomes much smaller, if allowed to cool down before the MOT it's rather large, you can easily feel it by moving it by hand. If both discs do it the same amount it's perfectly fine and I'd expect it from only 5k miles, if one moves more than the other you may have an issue but it's unlikely that's what they noted down.

[PJP1]

Thanks for the response. I would say there’s perhaps 1mm of lateral movement, minimal, the same on both. Maybe I will just keep an eye on it and rake it elsewhere for a test next year. Will also keep a look out for another XR and see if it’s similar.

[bobdave]

Sounds to me like the MOT tester is over reading the ministry of transport guideline book and covering his ass in case the ministry man turns up whilst the bike was there.
I would be more concerned if the disc rivets didn't allow any movement.

[Antares]

Originally Posted by PJP1

Thanks for the response. I would say there’s perhaps 1mm of lateral movement, minimal, the same on both. Maybe I will just keep an eye on it and rake it elsewhere for a test next year. Will also keep a look out for another XR and see if it’s similar.

I've already checked like 6 XRs cos I was worried too, they all do it lol I can't notice a difference between mine (25k miles) a mates (6k miles) and another Random guy's that looked like it had a lot of miles.

[Winger]

I’ve spent my fair share on aftermarket brakes in the past, have a bike with full floating Beringers that rattle like a musical instrument, but you have lost me with ‘Floating rivets’...the discs on the X/R bolt direct to the carrier, no movement on mine and if there was i’d tighten the bolts.

[Antares]

Originally Posted by Winger

I’ve spent my fair share on aftermarket brakes in the past, have a bike with full floating Beringers that rattle like a musical instrument, but you have lost me with ‘Floating rivets’...the discs on the X/R bolt direct to the carrier, no movement on mine and if there was i’d tighten the bolts.

Not sure what you mean. The XR has fully floating discs. The hub bolts to the wheel, the steel plate is held to the hub via circular rivets (that the outer ring "floats" on)

[PJP1]

Originally Posted by Winger

I’ve spent my fair share on aftermarket brakes in the past, have a bike with full floating Beringers that rattle like a musical instrument, but you have lost me with ‘Floating rivets’...the discs on the X/R bolt direct to the carrier, no movement on mine and if there was i’d tighten the bolts.

Sorry for my terminology. Simply, when you grab the outer part of the disc and tug or push it it moves about a 1mm or so on the ring of torx fittings.

[smithy]

Originally Posted by Antares

Not sure what you mean. The XR has fully floating discs. The hub bolts to the wheel, the steel plate is held to the hub via circular rivets (that the outer ring "floats" on)

Ummm...the XR's don't have "fully floating" front rotors...they're "semi-floating". The bolts which go through the rotors into the wheel have "spring washers" which allow a small amount of lateral movement.

Smithy.

[Antares]

Originally Posted by smithy

Ummm...the XR's don't have "fully floating" front rotors...they're "semi-floating".

Smithy.

Sorry my bad, I'm chatting sh#t, yes the rivets are fixed therefore it's not technically fully floating, but they are definitely not fixed rotors, I forgot these ones have the bolts going through the rivers themselves but the outer disc still moves (mostly) freely on the rivets in all directions