Quick Inner Tube Size Question
For years now I’ve been riding road bikes on tubeless. My new (to me) TT600RE is the first bike I’ve had since I was a lad with a tube. To be honest, I’ve not changed a tyre since I was a lad  now I’m 43 and slowly remembering how to do all my own work.
The bit I can’t remember is tube sizes…
My rear tyre is a
Pirelli MT 70 130/80 -18 66R
Front tyre is
Pirelli MT 70 90/90 -21 54R
Am I correct in thinking the tube size MUST match the tyre size
Also, is a heavy-duty tube ok for the road? Few sites I’ve looked at say “not for highway use” Why is that?
This place has Michelin HD for £12.99 – seems a lot for a tube, or am I just old
Michelin Heavy Duty Motocross Inner Tubes Motocross Gear from Dirt Bike Bitz
also they have 18 4.00/4.5 tubes for 5 quid…. They any good ?
Nutrak Motocross Inner Tubes Motocross Gear from Dirt Bike Bitz
regards
Shaun
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