Will a typical 80cc Chinese motorized bike kit work on a fixed gear bike?

[KCvale]

Quite a few companies are making fixies in 700c, so it's in no way limited to 24" and below. A quick search reveals a lot of them come with flip-flip hubs too.

Just a generalization and a moot point, the point is an MB will beat your legs to death with a fixie.

A flip flop wheel might seem ideal but it's not, even if you could find a big enough sprocket to screw on to it the threads are the wrong way for left side drive, it would spin right off when you hit the power.
And you still don't have a brake unless the bike has C or V rim squeezer brake mounts.

 

[Jeckler]

Sorry, I was misunderstood. I didn't mean using the flip flop to run a drive side sprocket. I meant to use it so the pedal side would freewheel and doesn't beat the crap out of your legs at 30MPH. The OP could still use the rag joint for the drive side. Or a sprocket adapter if it fits the hub.
Brakes are a whole other issue.

 

[KCvale]

Sorry, I was misunderstood. I didn't mean using the flip flop to run a drive side sprocket. I meant to use it so the pedal side would freewheel and doesn't beat the crap out of your legs at 30MPH. The OP could still use the rag joint for the drive side. Or a sprocket adapter if it fits the hub.
Brakes are a whole other issue.

Sure that would work, just take the fixie sprocket off to maybe fit a rag joint sprocket but for what a flip-flop wheel is worth you could sell it to get the $50 for the killer MB hub is all as buying an $80 hub adapter for an improper hub to begin with is just a silly waste of money to me.

On a a side note I ordered on of those $50 HD hubs with drive sprocket and band brakes yesterday to see if this Huffy is worth saving as it's hub is toasted.

I have no clue what the motor status is other than it was poorly mounted but the frame welds seem good.

 

[Waleed]

Might be, but fixed gears sometimes can be problematic at mounting the engine

A few weeks ago, I decided to build a motorized bike for my friend. I initially planned on restoring an older mountain bike, but later found out there was too much work involved in that bike, and I'd rather sell it for parts.

I ended up finding a good deal on a vintage schwinn cruiser bike for $20 (Had lots of surface rust, but most came off pretty easily). All I really needed to get the bike itself going without the engine was a front tube.

I expected the most difficult part to be mounting the sprocket on the rear tire around the hub, which is usually what I find difficult to get true. The coaster brake also makes it harder to mount the sprocket, it was mounted backwards so the brake arm can clear the chain properly. So I took it to a backyard motorized bike dealer I knew, and he charged me $25 to do it. The hub feels alittle loose though, but it rides fine.

The most annoying problem I faced was trying to mount the engine. The stock front sprocket was pretty large, and wouldnt clear the engine. I ended up getting a bmx sprocket(Should have thought of it earlier and saved myself the headache), and shortened the chain a little(Which I need to do again and take off the masterlink lol), and it made it easier on me.


Point being if u ignore the long story, is that it might be possible, but you'd likely have to get another crank, and the coaster brakes would be alot less effective if u tried to drive the chain side, and brake at the same time.

 

[Jeckler]

On a a side note I ordered on of those $50 HD hubs with drive sprocket and band brakes yesterday to see if this Huffy is worth saving as it's hub is toasted.

Let us know how that works. I'm curious myself as I've only seen a band brake in person once and it was crap. It may have been the cheap chinese scooter it was attached to as well though.
Did you get the freewheel version?

 

[Waleed]

I honestly think the best thing might be disc brakes. At least on the front and typical v brakes in the back. Coasters also work well, but they take getting used to. Which reminds me, I need to try to find a front caliper and a front wheel with discs

 

[KCvale]

Let us know how that works. I'm curious myself as I've only seen a band brake in person once and it was crap. It may have been the cheap chinese scooter it was attached to as well though.
Did you get the freewheel version?

It is a 2-stroke bump start so no I didn't order the freewheel drive side sprocket option for pull start engines ;-}

I have used many a band brake wheels and seen this exact one on the Grube GT2 (whatever) bicycle I build. They are somewhere between a side pull C brake and V or disc in my book.

 

[HeadSmess]

pffft, disc brakes, thing of the past!


what you need are these



rod brakes, ha ha. favoured in china and india...

v brakes and cantilevers setup correctly are simple, fuss free and work well enough to flip the bike with one finger... there are tricks in setting them up, just like everything else.

even decent caliper brakes work well, though the cheap pressed steel ones are useless. once again, setup.

it always amazes me how many different brakes they tried before somebody thought of v-brakes.... simple and effective.

my gripe with disc brakes? parts. i know i can always get plain old pads for caliper brakes.

whereas my shimano discbrakes... new pads are NA. sort of makes the brakes useless, not being able to source new pads...

to me they are bling. look cool, but arent 100% necessary.