Better Brakes Required!!
Motorized Bicycle project needs better Braking System. I have a 80 cc engine and the brakes sort of suck. Its a Giant Mountain Bike No Suspension Model. Any ideas guys ? Thanx Mike
I fitted 8inch mountain bike hydraulic disc brakes to my sons BMX bike 6-7 years ago. It took a bit of machining to get it on the wheel and welding for the caliper mount but they worked great.
Mountain bikes come out with these so you might pick up one cheap at the local big store to take the parts off. Over here in Aus they can be had for around $100-150 on special with mechanical discs front and back.
The parts and the wheels would cost you that if bought separate.
Bling rim brakes:
Although for some reason I am doubting that the bike is new enough to have disc compatible rims, but if it is:
I thought that the "Disc-compatible" rims were more "caliper-incompatible" as they're made without the parallel faces for rim brakes to grip? If anything the caliper rims are likely to be stronger (albeit heavier), being deeper section. Track racing (i.e. banked track) bikes used to have similar rims with a hollow triangular profile as they didn't need brakes and wanted to be as light as, I suspect I may even have a pair somewhere although the tubular tyres (glue-ons) have probably rotted to dust by now
Disc-compatible *hubs*, however, would need to be stronger as they'd have torque from assymetric braking force applied to one side though the hub body to the flanges which in turn would need to be stronger to support higher loads through the spokes.
I stand corrected .. I should have said "wheels" not rims.
Odds are that unless it is a custom built bike, he does not have disc hubs unless he already has disc brakes.
The other major factor for disc hubs the the mounting flange for the disc itself.
It's possible to make an adaptor for non-disk hubs to which a disk may be attached. I have done it. I don't have any pictures at the moment to show but I will see about that later.
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When I bought my Cannondale it had caliper type brakes but the hubs were machined for disc brakes, I had them convert it before it went out the door, my street bike has caliper brakes and compared to the disc's its like dragging your foot to stop.