Discussion in 'General' started by gixxerjoe, Aug 29, 2019.
Is it safe?
Burt Munro would be terribly disappointed in your answers guys. That's good weight savings there. Shame it's not a 6 bolt wheel, you could just take 2 more off and call it a day. Rotational weight savings at that!
Drill it out and get a new bolt.
Don’t throw away the wheel over an easy fix.
Just weld it
this won't be popular opinion.. but pretty sure motogp wheels often only have 3 bolts holding em in.
looks like the carrier is way on the outside on the wheel, it'd be fine if there are at least 4 other bolts in there. Way less leverage on the carrier vs a large carrier that has the small round hole where bolts to wheel. way more leverage there.
The Moto GP wheels are designed to be used with 3 bolts from the beginning. Would the Moto GP wheels be ok using only 2 bolts?
designed for 3 bolts., it's still 3 bolts ... explain how having 4 bolts in place, not all 5, as far out in the circumference of this wheel, is gonna be uber detrimental? The rotors already move a bit on the carrier. should it be fixed? sure. Will he die using 4 out of 5 bolts, an already very redundant design.. ? not likely. this is just my 2c. I'd personally race the fuker though while looking for a way to repair.
And some of ya totally losing your sh** over not using 1 of the 5 bolts.. have ya SEEN some of the bikes that somehow pass tech and are allowed on a track ? guys using take offs that a guy that bought take offs sold?
I had a rim missing a rotor bolt and didn’t realise it until doing a tire swap. Never felt anything wrong or had an issue,but replaced it asap regardless.
This guy tried to run with one rotor bolt missing
common now... LOL
I saw a bike racing at VMD years ago that was intentionally only running 3 of 6 rotor bolts on a front single disc setup. Some kind of home built single if I remember correctly. The other three bolts were wired, so I guess he passed tech. I remember thinking it did not seem like a good idea.
Another option, Helicoil.
3 of 6 on a repurposed wheel/rotor combo for a much slower bike I could see being okay. Different forces on the bolts at 80 versus 150.
@SpeedyTide.....(sorry Jeffah !!)
I’m not an enginerd, but I can do basic math.
Removing one bolt reduces clamping force of the rotor to the wheel by 20%
Removing one bolt reduces shear strength by 20%
I’ll let materials experts chime in on what those numbers come out to regarding how much force is compromised
Drill out the busted bolt and drill bigger and tap to fit a helicoil. Job done and safe, with out having to buy another wheel... especialy if yours is fine.
I too ran into a guy, ex-AMA 250cc racer, who ran 3 of 6 bolts in the two front rotors on his TZ250. I asked him, and he said, "back in the day, everyone did".
I have a TZ250 and I like all 6 in my wheels.
.. do you need to be an engineer to understand redundancy ? do you REALLY think they designed this wheel, for a commuter motorbike designed to go 100,000 miles on the street, perhaps never removing a rotor, that if a single bolt were left out or came lose, would result in catastrophic failure ? This is why you see motoGP rotors with 3 bolts of the same size as the FIVE used on street wheels.
I'm not sayin you should go remove a bolt or 2 from your street bike wheels, but everyone having a fit over 1 bolt is a little bit of overraction in MY OPINION...
Rocky Stargel sold me a marchesini wheel off his teams Formula Extreme R6 years ago. He had THREE bolts on the carrier adapter that bolts to the wheel. Rocky is a smart mother fuker. I don't think he'd put his rider at risk if he thought it was a problem.
Just remove one of your spark plugs and you will be fine.
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