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1

Adding to the answer by @mattnz ... This looks to me like an old frame to me. The steep headtube angle is supposed to be matched with forks that have more forward curve. And it should have drop bars. Here is another Parleigh, built as a fixie (from here): Notice the seat height, and the reach to the bars.


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If there's little stand-over space, then the frame doesn't fit you, and there's nothing you can do except get a new frame. Either get one with a shorter seat tube, or get a "compact" design with a sloping top tube. You can just stop reading here, but I'll answer your other points just because. You can move the seat back, or get a longer stem, or get ...


1

The bike was built as a racer and it looks you are trying to make it into a hybrid/Commuter and get a more relaxed riding position. This wont work as the geometry is wrong for that. Have you tried with the seat more horizontal. As it is, it will push you forward. Its also as far forward as it will go - slide if back on its rails. At the same time raise ...


2

The geometry of this frame looks odd. 622mm wheels are too large to fit comfortably in a 51cm frame. Usually sizes this small are made to compensate with very steep seat tube angle to let the rear wheel forward and very shallow steering angle to avoid toes clipping front wheel. This bike has been made the other way around and that is why it looks and feels ...


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You'd need to replace the hub (i.e. build the wheel with a new hub -- typically, its better to just get a new wheel), and then respace the frame (i.e. coldset) to take the new hub. It's easy still to find freewheels, so I'd recommend you just replace the freewheel.


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Those are already manufactured, as "stealth mountain bikes" in Australia. They're not popular with many people because they specifically designed to be ridden in mountain bike only areas... they're big, heavy, fast and hence dangerous to actual mountain bikers. But they will give you some idea of what you'll need to do to make your idea work. And note that ...


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EU and most other jurisdictions outside NA the limit is 200-300W for a pedal assisted push bike. Above that they become Moped's then motorcycles. North America has looser regulations. Regardless of the limits, in most cases once you get above the limit, the bike will need registration, number plate with lights, indicator, brake, headlight and tail lights ...



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