rear hub bearing sizes

[tanto]

The 6908RS's from Honda are 12mm joined with a plastic clip. I see you just used a single 24mm bearing. Any theories or knowledge on why Honda used two bearings instead of one?

At the time I compared the "double bearing" and single bearing side by side. As heat is a problem in Thailand that swung the decision towards the single bearing.

Since then I've been following a thread over on http://www.mvagustauk.net/forum/forum.php regarding earlier F4's with under-engineered rear hubs.

It seems to me that, assuming safety is the over-riding priority (rather than weight, for example), safety would influence the choice of bearing. As it is the NC30 hub is well engineered - there's no "flex" in the hub when the swing-arm hub bolt is tightened, which is part of the problem with the MV Agusta design. Hence the probability of a catastrophic bearing failure is remote given reasonable inspection and maintenance, and no "jet washing".

Of course I could be wrong, and two bearings side by side might be safer than one. But I doubt it, especially in hot or race conditions where lower temps should contribute to lower wear and greater longevity. I'd be interested to hear anyone else's view.

[V4beermonster]

just been to the local bearing supplier all 3 are common bearings just got the 3 for £40 happy with that. just need a rear disc now

[Drunkn Munky]

just been to the local bearing supplier all 3 are common bearings just got the 3 for £40 happy with that. just need a rear disc now

Do you have any part numbers/order codes for these?

[V4beermonster]

will find out tomorrow

[V4beermonster]

koyo 6908-2rs x2 roller bearings. NK.50/25 x1 needle bearing. I use the bearing chap quite alot so £40 was a special price to me but the set would normally be aroung £70 which is still loads cheaper than Honda,,,how supply koyo and NK bearing as stock

[Username]

I use Simply Bearings for all motorcycle applications. Front wheel SKF bearings are very reasonable.