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I know.... really dull!!
anyway, engineers assemble I have a question.
i ride a pivot Mach 5.7. In the lower linkage are two pairs of 6802 bearings. The outer bearing on the drive side seems prone to premature wear resulting in excessive play, it actually feels like the rear end is steering itself.
my theory is that one bearing with bigger ball bearings inside will distribute the load applied better.. to that end a 3802 has the same internal and external dimensions, just twice as thick as the 6802.
is there any reason using the single bearing would be worse than the double? There must be a reason it was specced with the pair, is there a good reason I can’t use the single??
I’d appreciate your thoughts!!!
Ok, I'm no expert!
Only thing I can think of is that having 2 bearings essentially gives a broader area to transfer the forces through?
That said and without looking at the bearings you mention, how can the 3802 be twice as wide (and have bigger bearings in) without the bearing inner being smaller? Unless they aren't spherical bearings?
Someone will be along later no doubt to point out why my thinking is totally flawed though. No doubt they are correct too.😁
It's very early but I'll have a go.
I think 3000 series are double row angular contact type bearings. With it being double row, you're less dependent on being able to adjust preload as you are on a single row.
Have you been using max compliment bearings or standard ones previously? I think there's also a max option in a 3082.
Enduro hear mgs can be a bit of a double edged sword though. The bigger balls will carry more load but for full rotation bearings, they're not the highest spec.
There's nothing stopping you from trying a double row I can think off - the bike certainly won't burst into flames.
Why is original spec for 2 x 6082? It could be cost, availability or something form of convenience. Lots of engineering choices get made for reasons other than engineering excellence.
That said and without looking at the bearings you mention, how can the 3802 be twice as wide (and have bigger bearings in) without the bearing inner being smaller? Unless they aren’t spherical bearings?
of course.. and as professor onzadog says it’s a double row in a single housing.
I have been using the max compliment (well I’ve been buying 6802 llb max) they just don’t seem to last very long.
at £20 a bearing to try the 3802 is quite an expensive experiment! More research I feel!
It's not significantly more than two singles is it?
With the 3082 being angular rather than the purely radial of the 61802, I'd imagine you'll get a but less radial load capability and a lot more lateral load capability if you tried the 3802.
If they're the drive side going first perhaps you need to take more care when washing the bike? I've noticed the drive side on mine are always more corroded.
I think the 5.7 and other Pivots of that era had a relatively narrow off-centre lower linkage as they could run 2x or 3x. Doubling up the bearings on both sides probably helps, but I think it will always eat bearings regardless of what you do. If you are just swapping the linkage bearings once a year, then that's probably ok and I don't think much can be done to improve that.
IANAE... obvs.
Just make sure you specify the right 3802 bearing as well. The standard 3802 is 15x24x7 and it's the 3802 W that is 15x24x10. The static load for a 6802 MAX is 310lbs, the standard 3802 MAX is 940lbs and I do not have the figures for the W type sadly. The 3802 W-LLB is 520lbs as well.