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[Wishbone]

Have been lurking on MBc for a while , enjoy the passion of MBers. I've been peddling anything I could ride all my life, Cruiser, MTB, Road, Bent, & Pedal Cars. Never though riding a Motorized Bike could be so much fun.

I have a Custom Schwinn Road bike modified w/ 25cc Honda 4 Stroke w/ jack shaft friction Drive w/ 4" grinding wheel. Have ridden in the rain & it does not slip.

I do need fenders though, & a basket would be nice. As a tinkerer I have enjoyed the creativity of the members of this site. I will try & get some pic's ASAP.

I live in Derry, NH , very hilly & soon to be cold.

 

[Alaskavan]

Welcome to MBc. How fast does the grinding wheel eat the tires?

 

[Wishbone]

Hi, glad to be aboard.

Grinding Wheel (GW) does not seem to eat tires at all. Circumferance of grinding wheel is over 12", so it is not spinning as fast as a small wheel. W/ engine spinning @ 3K rpm wheel spins ~ 800 rpm. I just installed 56T spocket on GW shaft w/ 15T drive cog, this gears it much better than 32T sprocket did (too high). Now it climbs very well. When I want to slow down a bit I shut down the throttle & I get some braking action w/ the friction drive.

 

[Alaskavan]

Cool. Can you post pics of your setup?

 

[Wishbone]

Grinding Drive

Here goes, some pic's.

 

[Alaskavan]

Good work there. Thanks.

 

[SirJakesus]

Sweet, another New Hampshirite.

 

[Happy Valley]

An interesting setup, centers the motor over the rear wheel.

When I want to slow down a bit I shut down the throttle & I get some braking action w/ the friction drive.

Curious:

Does that mean you're not using a clutch on the motor?

What speed range are you getting with present gearing?

How do you control down pressure on the tire?

 

[Wishbone]

Friction Slowing

Hi HV, On braking action, Motor has a clutch so all of the slowing is due to friction of the wheel against the tire, (mostly distortion of tire). Slowing is not dramatic , but a nice effect.
On engaging Grinding Wheel, Currently I just open quick release & lower front of rack until GW depresses tire. I have to stop to disengage. It would be nice to be able to do it on the fly w/ some type of cam lever. I estimate ~25-30 mph.
I just mounted a chain cover. Next will mount a speedo.

 

[xPosTech]

Welcome to MBc.

You mentioned wanting (wishing for?) fenders. How you gonna do that with a friction drive? Will you cover the GW with a big wart on the fender? Or slot the fender for the GW?

Just curious. Interesting problem. I like quandaries.

Ted