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As above really. 😃

Doubt it...look the older model; what year are they?
Are these like most other RS air forks and need a change of airshaft to change the travel? Prob best to ring TF Tuned or J-Tech for advice / to see if they stock a replacement airshaft.
if anything at all, you may be able to conver to 110mm travel using a longer air shaft. There were a few earlier 29er solo air models which allowed this, then they stopped and limited it to 100mm, then the new 120mm were released.
Just done this. Way to check is look at the stanchion markings as mentioned hereย https://forums.mtbr.com/shocks-suspension/rockshox-reba-adjustable-120-a-1040950.html
You will need a new air shaft for solo air at about 25-30 quid. Got shop to swap it for me while servicing.
iirc the QR version are 100mm maxย and can't be converted but the 15mm ones can be converted to 120mm.
yeah, got the air shaft to do mine sat here (look like the same graphics but straight steerer).
As above, the QR ones are not able to be taken over 100 but 15 and 20mm axle are. I also upgraded mine to a better damper. If you perform a lower leg service you should see the markings for a 120mm travel, or maybe just try and peek under the wiper seal for the 100mm marking extended to 120.
@andyl what damper did you put in it?
picked up a black box damper from the same era fork from the planet X clearance a while back. I think the only upgrade left to do is the rebound damper but I was struggling to find info.
Also putting a token compatible top cap in so I can change the air spring ramp.
Thanks andy - was unsure if blackbox damper would fit. Tokens definitely helped mine. Charger 2 damper is other option but pricey.
I've got a spare 120mm reba 29 airshaft, pm me if interested in it if you like.
yeah hoping tokens will help a lot. Find the single air a lot harsher than the older dual air. So much so I have a spare set of 120mm dual air rebas from a year or two prior. Lovely 20mm axle too.