Grubee 4Stroke kits are in along with much more

[sjackson]

I was going to say the "vintage" style fuel tank. Apologies if it's not new, just the first time I've seen it.

But! I just noticed the rear rack fuel tank... don't know if that was there yesterday or not, but I'm placing the order now!

 

[square]

That sounds good, I'll check this out for my new 4 stroke build.

 

[Skyliner70cc]

Uhh, where is the website to buy 'em?

 

[biketec]

WWW.bicycle-engines.com

 

[TWalker]

I was going to say the "vintage" style fuel tank. Apologies if it's not new, just the first time I've seen it.

But! I just noticed the rear rack fuel tank... don't know if that was there yesterday or not, but I'm placing the order now!

Where did you find a rack mount tank? I dont see it.

 

[biketec]

under 4stroke parts rear mount.

 

[Skyliner70cc]

Biketec,
There has been a lot of issues with gearboxes such as stripped gears and gear noise/whine with some 4 stroke kits. Is this a known issue with your 4 stroke kits? Also, I can't tell from pic, but does your kit come with a way to widen the pedal spacing (wider pedal crank?)

Thanks,
Sky

 

[cgbjake]

I sent you an email on your site, but I'll list it here for everyone else. What is the gear reduction for your system. I may be missing it but I haven't seen it.

 

[ocscully]

I sent you an email on your site, but I'll list it here for everyone else. What is the gear reduction for your system. I may be missing it but I haven't seen it.

The Grubee 4-stroke kits have a total reduction of 18:84:1 The gearbox provides 3.7:1 and the final drive 11t to 56t to just over 5:1

ocscully

 

[skyl4rk]

The Grubee 4-stroke kits have a total reduction of 18.84:1 The gearbox provides 3.7:1 and the final drive 11t to 56t to just over 5:1

ocscully

Am I calculating this right?

Assuming a motor speed of 3600 rpm:

3.7 x 5 = 18.5 gear reduction

3600 motor rpm / 18.5 = 195 wheel rpm

195 wheel rpm x 60 minutes = 11700 rph (revolutions per hour)

Wheel circumference: 3.14 x 26" = 82" or 6.8 feet

11700 rph x 6.8 feet = 79560 feet per hour or 15.1 mph

15.1 mph cruising speed at 3600 motor rpm doesn't seem right, or did I make a calculation error?