03/03/2025
Single Side Swing Arm (SSSA) Rear Axle Hub.
How many of you regularly service the rear axle hub of your SSSAs?
How many of you with SSSAs struggle to move the chain adjuster to correctly tension your chain?
Over time the inside of the rear axle assembly accumulates dirt & muck off the road. This builds up and causes the eccentric adjuster to seize, making it nigh on impossible to adjust the chain.
The photos here show how bad it can get, and believe me, this is not the worst I’ve seen.
There is a drain hole there to let out any water that gets in there but it’s only about 2.5mm in diameter and very quickly gets blocked. Once it’s blocked the muck begins to build up and will eventually cause corrosion on the inner SSSA surface as shown here.
My advice to those with SSSAs is to make the dismantling, cleaning, regreasing and rebuilding of the entire assembly part of your routine maintenance. Do it over the winter months when you’re not using the bike. Doing so also gives you chance to check the condition of the bearings within the eccentric adjuster.
If you want to do it yourself and want to know how just ask.
Oh, just as a PS, when you get your wheel removed to have the tyre changed DO NOT allow the tyre fitter to use his impact wrench to do up the rear wheel nut. Yes, I know it’s a big torque value, 230Nm, but do it with a proper torque wrench. Too many places are lazy and use their 500Nm or even 1000Nm impact wrench to tighten the nut. Not only could it shatter the wheel nut or cause stress fractures but it makes it nigh on impossible to remove.