BlueSunshine Front and Back Disk Brake Kit - 160mm For 80cc Gas Motorized Bicycle - Freewheel Threaded Hubs Hole distance of 48mm

The brakes were a bolt on for our MX650 with out the extra ring on the discs. The brake handles are garbage. The left one broke in my 12 year old sons hand on the second ride. He did not crash, he did not fall over, but when he pulled on the brakes, the silver pull snapped.

good item

These are commonly recommended by razor mx500 owners. Bolt pattern for the rotor matches. You take the adapter off the rotor. Bolts right up. Caliper requires proper spacing. Front cable is long and needs some trimming. Better than to short. I do since thebfront had a bit more pressure for my application, but I'm pleased overall. Nice little kit for the price. Will be upgrading to some sort of hydraulic setup using these rotors soon. I did notice most users failed to ensure the bolt pattern was correct prior to purchase. Does seem to be odd, and not sure what else they would even fit.

These failed on me. I installed them correctly and the piston just would hold any pressure...meaning lever went all the way to the handlebars after careful perfect adjustment. I will say this though, I have a very heavy bike. I go down hill alot. So if you're doing some light riding on a flat surface these might work for you. But if you're doing any serious riding, do NOT buy these. Just bite the bullet and spend the money on Avid brand calipers and brake pads. They're not cheap but you won't die either .... So you decide what'sore important, your life of $50. If you are going to buy these I cannot stress enough that these are not even halfway decently performing brakes.

It was a heck of a time getting the adapter off i had to shave the bolt heads down. Only to find that i need a diffrent/ smaller bolt separation i got the 44cm but i need the 42cm. Not the sellers fault, so when i get a chance im going to get the size i need from this same seller

Does not fit even though I measured my wheel diameter for disc brake before ordering. Look at my picture, the black piece is my wheel spacer and disc rotor holes do not match up. Buy these at your own risk , I do not recommend.Update - I was finally able to install this brake kit (after retro fitting the holes), I went on a test ride and these brakes do not have any grip to stop the bike, what the heck is going on with these cheap crappy Chinese disc brake kit? I even went back to the garage to recheck, realign, and clean the surfaces, still does not grip enough to stop the bike- these are the worst quality ever!!!! Totally regret buying this crap.

Pretty nice kit. Was actually surprised at the quality for the price and it worked great! The last bike I add disc brakes to cost me about $175.00 (wheel, caliper, rotor, cable and lever, etc) I used this kit and two old mountain bike rear wheels to add disc brakes to the front of two bikes and spent less than $30.00, FOR TWO!!!!! super pleased.

2 stars because although they work pretty well, they came damaged and all scratched up. There was absolutely zero packing material to keep the calipers from rubbing on the rotors resulting in a really trashy look like they were used on arrival. The bolts used for the rotor are also of low quality. I'd recommend replacing those with high torque metric bolts. Also the rotors are pretty thin. Actually thinner than my stock rotors. Hopefully this is a weight reduction bonus, and not a performance reduction/warping over less time. I will update later after using them for a bit of time.