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Mrs_oab has Reba Solo Airs, now suitably broken in.
They are not supple, and rebound is almost totally off to get reasonable return rate.
Her old Cannondale Headshock had lighter oil in to speed up and assist suppleness - it worked really well.
She's only 7.5st, smooth not aggressive rider.
Should I just pop a lighter oil in, or is this solo airs just not being as good as dual airs or Fox self balancing.
lighter[less viscous] oil always helps
How well only a service will tell
Providing they're not blowing through on the compression stroke then yes lighter oil will make them feel a bit more supple, you'll just need to add a couple more turns of rebound to bring everything back into line. Iirc Rebas use 5wt as standard, if you've not done it before its just a case of unscrewing the damper cartridge then draining and refilling with the correct amount of oil, its a ten minute job, for the record Solo airs are also self balancing.