should i keep rim brakes
Posted by howareyouotaku@reddit | ebikes | View on Reddit | 20 comments
hi im getting a 3kw 60v conversion it but my bike came with rimbrakes and iam kinda worried that they wouldnt be enough specially because of the power of the bike, so i thought of changing to disk brakes but to get decent ones its like 100bucks and thats a lil too muich for me so i though of only switching the front brakes to disk brakes and keep the rear specialy because i just switched the brakes bads and thightened them.
what do you guys think
Adventurous-Quote190@reddit
Return that conversion kit if you still can and get your money back. It sounds like the bike you are trying to do this with is not compatible. Rim brakes are probably just the tip of the iceberg of problems you're going to have.
howareyouotaku@reddit (OP)
Adventurous-Quote190@reddit
That wheel does not look like it will handle the torque of your 3k watt motor. Like I said, your brakes are just the tip of the iceberg of bad outcomes. Good luck to you.
howareyouotaku@reddit (OP)
but what i wanna know is whether its suitable for diskb brakes or not
howareyouotaku@reddit (OP)
im changing the wheel since im getting a hub motor so the wheel isnt an issue either
howareyouotaku@reddit (OP)
is it compatible ikknow tht everything else is perfect i took it to a repairshop for a check up told me thath everything was good just needed to pump my suspention
eBikeHelper@reddit
Rim brakes vs disc brakes is one piece of the puzzle. Another piece, arguably more important, is the build of the rim. This recent post is a perfect reason why rim build quality is important:
https://www.reddit.com/r/ebikes/s/HljoTbmx5j
Rim brakes can be fine if they are high quality and well maintained. Magura makes solid hydraulic rim brakes. Which cost more than $100.
The challenge is that very few rims are meant for rim brakes and also meant for the unsprung weight of a hub motor, plus the weight of an ebike, plus the speeds of an ebike hitting a pothole. The above linked post is exactly the scenario that is a concern.
All of a bike's components rely on each other. Like a chain. The chain is only as strong as it's weakest link.
You can have the strongest brakes ever but if your rim isn't going to survive a pothole hit, then the money put into only the brakes wasnt wisely invested.
howareyouotaku@reddit (OP)
howareyouotaku@reddit (OP)
alright thank you so much that was actually really helpful right now im waiting for someone to tell me whether my bike is fully compatible with disk brakes or not so i change it completely to disk brakes
celeste_ferret@reddit
3000 watts on a cheap old bike that was designed for roughly 100 watts, what could possibly go wrong?
howareyouotaku@reddit (OP)
its not really its old but not really cheap i got it in 2018 for aroud 660dollars havent used it much tho only like 200km
Lebucheron707@reddit
I’d stick to 500W and under for rim brakes, but that’s just me.
howareyouotaku@reddit (OP)
yea but ill prob switch to disk
Inciteful_Analysis@reddit
$100 is much cheaper than a hospital visit. Even a normal ebike with a 750W motor should have hydraulic disc brakes. Using a 3kW motor with rim brakes is dangerously insane.
howareyouotaku@reddit (OP)
ok thanx ill see whether i can replace both brakes or not price isnt the biggest issue its also compatibility that im worried of the most becuase if i get the brakes and they dont fit i just spent like 140 dollars on nothing
classaceairspace@reddit
Check your front forks to see if you even can, also check your wheel because it probably can't mount a disc. Now check your frame because chances are you can't mount brake calipers to them. If your conversion kit is a hub motor, then I assume they include the brake disc assembly, but if yours is a mid-drive then you'll also need to check your rear wheel to see if you can mount a disc, which I assume you probably can't.
howareyouotaku@reddit (OP)
howareyouotaku@reddit (OP)
hey so i still didnt order the kit bbut iknow it doesnt comme with the brakes, but iam pretty sure that i can only put them on the front wheel might be wrong tho so im just gonna show you the places where i think are the mount for the diskbrakes
Zenigata@reddit
If you go for disks you need to go for fairly high end disks with good heat management.
Cheap disks handle heat worse than rim brakes which is why you should never buy a cheap tandem with disk brakes.
Ohm_Slaw_@reddit
Rim brakes for conversions are fine -- up to a point. And you are way, way past that point.
I would do disc brakes for both wheels. You definitely have the "go", but now you need the "stop."
You can save some trouble by replacing the front fork with something equipped for disc brakes.