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I suspect a freewheel (6 or 7) will fit the hub but there could well be frame clearance issues.
When I converted a BMX to 1x5 (then 2x5, finally 3x5) it involved an axle spacer, dishing the wheel and cold setting the frame to prevent the chain catching the seat stay when in 'top' gear.
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will a 7 speed screw on freewheel fit the hub ok, bearing in mind OLD is 130mm
Yes, but as Mr_E says you will probably have to swap spacers around and re-dish the wheel. Also, 7-speed freewheel hubs are a liability, as there is about a yard of unsupported axle between the dropout and drive side bearing. It would be much better to get a new cassette hub (Sora is fine if you're trying to keep the budget low), and that would also facilitate 8/9/10-speed which is even more flexible and future proof than 7-speed.
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MrE
gbj_tester
@pizzarat
I am hoping to convert my single speed foldy bike to 1x7 gears (it is my most aesthetically undesirable, but seemingly most useful bike). It has served me well on and off for the last year. But the current gearing is cack, and the chainline is awful so it's noisy.
Decathlon already sell pretty much the same bike with 6 speeds, but I'd like to use 7 as I think it will give me a few more shifter and derailleur options to choose from...?
The frame already has the various bits and pieces needed for cable routing, plus a derailleur hanger. The rear wheel has a single sprocket screw on freewheel which can be removed, and, presumably a replacement block screwed back on in it's place.
TLDR / here's where I'm stuck :
will a 7 speed screw on freewheel fit the hub ok, bearing in mind OLD is 130mm. Or should I stick to a 6 speed (boo) setup much like the ones they already sell?