26 Inch 25.4mm 1 In thread steer 175mm long
Have you asked on 'Retrobike' ? 1" threaded steerer is the norm over there.
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I bought a set of Clarks brake calipers for £15 when getting bike going last summer. I'm now thinking they are not the best?
Is there much difference in performance with brake calipers? I'm thinking yes now but originally I was thinking maybe not really for what I want.
It depends entirely what type of riding you do.
If its pottering along the road, then most low end brakes are going to stop you fine.
Ebikes due to the motor and battery weigh a lot more than standard bikes, so with that in mind, and consider its your life at stake, then the brake is as an important part that you want to spend more on that anything else.
Slow round the town speeds, more or less coasting to a stop then a £15 will suit, faster than that or sudden emergency stops then maybe spend more.
If you ride really fast or in an offroad setting, then all braking is pretty much the equivalent of emergency stopping, because in those settings you really really must be able to stop in time.
To sum it up - When it comes to brakes, cheap as possible is not the criteria you should be looking at adopting.
You are correct though. Not all hydraulics are created as equals. Just because it is or says 'hydraulic brakes' doesnt actually mean they are any good in all settings.
But its not just the ability to stop. Its whether it is always going to need bled, or fettled with. You also want something that going to do the job consistently