largest gearring availble for lwb
 

I am trying to convert my lwb tour easy clone to a vehicle that can approach or exceed 35-40mph.
Any suggestion as how to do it?

For 40 mph, all you need is standard gearing and a downhill -- with a 700c wheel, a 53/11 gear, and 110 rpm, you'll be at 41 mph. If you want to hold those speeds, you'll need a big motor, a bigger chainring, and a full hard-body fairing.

Hostel Shoppe still sells the Vuelta chainrings, up to 60T. That causes other problems however, in that there's a limited range that a front derailleur can reach across, unless you rig up compound gearing somehow (two rear deraillers like on the Rotator Pursuit, or using a Schlumph drive crankset).

There's no easy methods for making good full-fairings I've ever seen, particularly for a two-wheel bike. For an easy-to-implement (and safer) fairing, you could just go with a front Zipper or Mueller and a body sock kit.

With this combo, you may not be able to get up to 40mph on level ground but you'd hit it pretty easily down hills.
~

Unless you're expecting to have a hill do all the work for you, hitting 40 mph, even with a full fairing, will require a significant output of watts. Speed ain't free.

1) Find a long (as in a few miles), steep hill.
2) Ride to the top.
3) Turn around and come back down. Don't touch the brakes.

You should hit 35-40 mph no sweat.

SP
Bend, OR

fyi I have a tailbox on my bike(a version of andrew carson's diy recumbent Lwb). It has a clearance of about 10 inches for the 50 teeth gearring.

Is there a sentence or two missing? With a human sitting there between the tail box and large ring ten inches of clearance between the two does not make sense.

I know Dennis Grelk makes chainrings to order, CNC machined. I think he has the facilities to make up to a 100 tooth ring. How big are your quads? :)

Schlumpf Speed Drive or High Speed Drive. http://www.schlumpf.ch/antriebe_engl.htm
How big a gear you want?

I'm currently looking at either Hostel shoppe gearring supply or Raptobike. Either have a decent supply of gearrings. I may need a 130 bcd crank arm. Any advise?

130mm BCD is the road "standard". Any Shimano road crankarm made since the 70's will work.

Almost. The key word being "standard." Compacts are 110mm BCD.

I love standards- there's one for everyone!

When I saw this pic I thought of this thread.....

http://farm3.static.flickr.com/2597/...7ef796f0_o.jpg

That chain ring is HUGE. Just totally impractical for your application I'd think.

FYI My tour easy clone (with a tiller and tailbox)wheel base is 66". that does not include front part of
tire to tailbox end. O-----O >