You can't, it will be a screw-on freewheel not a cassette. Furthermore the rear will be 126mm spacing not 130. There are 10 speed freewheels, which doubtless need a 130mm rear - you might be able to modify your hub, but you may run out of axle length. You will be able to spring the frame outwards or (better) re-space it. If you want to run 10 speed you will also need a new chainset as the existing chainrings are too thick.Yes it is a six speed and I was wondering if I could swap the cassette some how
10S freewheel from eBay and China - no guarantee it will be trouble-free though.
https://www.ebay.co.uk/itm/39494831...55-0&msclkid=82de12ba719b1a29194474d31b82f6c7
Just beware that the more you want to change, the worse the spiral of modifications, complexity and cost. Personally I would stick with the existing drivetrain.
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