I wonder if anyone has every paid £14.99 for ithttps://www.planetx.co.uk/i/q/WSVITTVNFPV/vittoria-valve-nut-for-presta-valve-tube
Reduced from £14.99 to 99p!!! In Px clearance.
And a choice of flat edge or round edge!
A bargain at a tenth the sale price, methinks.




As well as stopping you pushing the valve into the rim when the tyre is flat, the valve nut is an adjustable small weight so you can counteract the weight of the joint strengthener inside the rim opposite the valve and balance the wheel perfectly. If you throw them away, then I bet when you pick your bike up, the wheels rotate to valve up. You'd feel the vibrations from that weight imbalance when riding if you were mechanically sensitive. 99p is worth it not to have your wheels unbalanced.