Anyone with 212cc Predator on a Shift Kit?

[5-7HEAVEN]

It’ll be like a big-block Chevy in a VW Bug.

 

[5-7HEAVEN]

I'll be forced to use 1/2" x 3/32" multi-speed chain on this 212cc shift kit install.

This is the weakest chain, compared to #40/41 chains.

However, it's the only chain which fits thru the derailleur for my 7-speed freewheel.

I intend to run a timing pulley from the clutch to the pulley on the bottom bracket.

Then a 24t sprocket on the right side transmits power directly to the rear wheel cassette.

No jack shaft!

Maybe using a timing belt will help "absorb" the drivetrain shock and keep the thin bicycle chain alive.

IFFF this chain breaks too often, there's a Plan B.

I have a Sturmey-Archer 8-speed internal gear hub(IGH)from an old project.

All it'd take is to use a 23t rear sprocket.

Then switch the chainring from 24t to 30t.

And run a super strong #41 chain to the rear wheel.

That'd lower the 8th to 5:1 in 8th speed,
and 1st gear would be 16.25:1.

Perfect gearing.

 

[5-7HEAVEN]

I'm waiting for my timing pulley to arrive.

Even though it has 150 teeth, the gear ratio passing through the bottom bracket is only 6.52:

That's because there's no jack shaft to multiply the gear ratios.

First gear will be ok at 9.24:1.

Fourth and Fifth gears are ok at 5.43:1 and 4.89:1.

Sixth and Seventh gear will probably be useless at 4.35 and 3.80:1.

 

[Chainlube]

I'm waiting for my timing pulley to arrive.

Even though it has 150 teeth, the gear ratio passing through the bottom bracket is only 6.52:

That's because there's no jack shaft to multiply the gear ratios.

First gear will be ok at 9.24:1.

Fourth and Fifth gears are ok at 5.43:1 and 4.89:1.

Sixth and Seventh gear will probably be useless at 4.35 and 3.80:1.

If you could get it into 7th on the highway, you'd be doing a 100.

 

[5-7HEAVEN]

Lol, I'll settle for 50mph in Fourth gear.

 

[Chainlube]

Lol, I'll settle for 50mph in Fourth gear.

To me, 50 is crazy! But I do enjoy 30-40 alot! I only do 20 when I cruise through the orchards.

 

[5-7HEAVEN]

I've never been to 50mph.

My bike has seen 45mph once, years ago.

I also like it in the 30-40mph.

Whatever the speed limit,
I'll abide by it.

There are times, when I have to sprint to 35-40mph,
in order to distance myself from the many cars behind me.

Once I hit the speed limit,
they can't make up the distance.

Then I'm safe for awhile.

I think I'll love the acceleration to
help me keep away from the cars.

 

[5-7HEAVEN]

Major design change.....

The 212cc engine will mount with its clutch on the bike's right side.

Staton's gearbox will be used. It yields 3.75:1 gearing in Mid-drive, while allowing the chain to
spin clockwise.....

and connect to the shift kit/bottom bracket.

First gear will be 11.81:1.

Seventh(high) gear is 5.91:1.

 

[5-7HEAVEN]

Well, back to running power through the BB.

Staton gearbox has been ordered, but I still want to finish running power through the BB.....
and through the shift kit.

Gear ratios will be relatively mild, with First gear of
7.61:1 and Sixth gear of 4.35:1.

Seventh gear is probably unusable at 3.8:1.

 

[odessa]

Maybe big engines demolish gears, cassettes, chains and derailleurs. Who out there runs thru the shift kit? What gear ratios? Torq convertor needed?

I've tried with little success if you can keep the chain tight enough it kinda works and by that I mean if it doesn't throw the chain off you won't be shifting gears the motor has to much torque. A torque converter may have helped with issue of it throwing the chain since the belt would be able to slip but I think you'd still have the issues of it pulling the derailleur all the way out so you'd still only have one speed