• always remove core to add, sealant clogs up the presta mechanism.

    This.

    Also remove core when you blast the tyres to get it to seat, not always necessary (especially if you can just pump up the tyres) but make a big difference if you struggle.

    If you're fitting a new tyres on, it's sometime just easier to pour in the sealant from a unseated part of the tyres.

  • Always did that with MTB. For some reason (I think less carcass to play with), I inject for road tyres

  • yeah not much room with road, to be fair I tend to use a truing stand bolted onto the workbench to make it easier.

    Pour in, turn 180 degrees, then plop bead in.

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