Nabeaquam
BoTM Winner
A cassette multi speed will almost certainly thread on. The wheel is probably not dished for this and your chain line will be off. The wheel won’t be centered in the frame without dishing. Also the rear spacing on the bike frame will be too narrow and the hub will need a new axle and a spacer for the hub to have the axle extend beyond the hub drive side. You need to take the wheels to a bike shop to make sure they’re ok. It appears that some of the spokes on the rear wheel are not under crossed on the third cross but it’s hard to tell from a photo. It might need to be rebuilt properly. The Bike shop can see about having the wheel rebuilt and dished if a longer axle can be found in the proper threading for the cones. If you use a cassette the chain for it won’t fit on a standard single speed chainring. A BMX spider can be fitted and a multi speed chainring could be used. It would have to be a narrow wide chainring if you go single chainring. I don’t think a spider would work on a narrow wide. You could also use a bottom bracket adapter and use a two or three chainring crank.
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