Utah Trikes - Sid's Gas Quad

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Sid's Gas Quad

Get your own Utah Trikes Quad
Almost as soon as we made the official announcement of the Utah Trikes Quad, we got enquiries about power assist options. Well, the good news was that we had been working with some gas assist options already. We posted one of the early prototypes on our articles page a while back. Well, after much more testing and the help of several local Quad customers whoe were willing to do a lot of testing for us, we have finally acheived what we wanted.
Sid's quad is one of the first of our "standardized" Gas Quads. It features a custom rear end with the Nuvinci transmission and motor tied to the rear axle assembly. It's fast and solid!

One of the first things that we learned in developing the Gas option for the Quad was that the Nuvinci and the motor needed to be joined together on the rear axle assembly. Here you can see the right side of the motor assembly and two of the three chains.

Here you can see the left side of the motor assembly and the primary drive change from the Nuvini mid-drive transmission. You can tell that the placement of the whole setup has to be very precise because of the clearance issues. You can also see that for our final version we have moved the seat stays to the motor mount, which shifts part of the rider's weight directly to the Quad rear end.

The motor slides forward on the axle mount and is secured via the sloted plates and a plate on the bottom of the motor mount. This adjusts the tension of the primary drive train going to the positraction axle.

The threaded shaft you see is used to adjust the tension of the motor drive chain going from the gear reduction box (motor) to the Nuvinci's input shaft.

Rear Idlers
To keep the pedal chain lined up on the Nuvinci's freewheel it is necessary to keep both sides of the chain lined up with a stacked idler arrangement. The chain tension is set by sliding the idlers towards the rear of the Quad as needed.

You can also see our aluminum brace that triangulates the motor mount between the Quad rear axle assembly and the frame. This piece runs nearly parallel to the drive change and completely eliminates any flexing at the rear end from pedaling or from the torque of the motor. This piece alone allowed us to get 5 MPH more out of the Gas Quad.

Power Brace

Clearance
The quad has great ground clearance. With no derailleur hanging down and raising the idlers up there is a lot of room.

Nuvinci CVT
The Nuvinci CVT transmission is at the heart of our Gas Quad. With a dual freewheel setup you can pedal without the motor, or use the motor without pedaling. Best of all though, you can pedal and use the motor at the same time for max power, speed, and workout. The Nuvinci transmission has no gears and allows you to select the best ratio for power or speed.

Nuvinci Shifter
The Nuvinci's shifter is a twist/grip shifter. There are no distinct gear positions, instead you twist it one way for a low ration and the other way for a high ratio.

Avid BB7 brakes
If you go with gas you need the larger brake pads of the BB7 or Juicy brakes. The BB7 is also easier to adjust than the lower brake options.

With the high speeds the Gas Quad is capable of we highly recommend the Marathon Plus tires. Believe me, you want more rubber.

Avid BB7 brakes
The BB7 brakes are adjustable from both sides of the caliper without tools.

Kill Switch
The kill switch is mounted to the top of the handlebar mount for easy access.

Double Sprocket
The Nuvinci is setup with a double sprocket on the input shaft. The larger sprocket is lined up with the gear reduction box on the motor. The smaller freewheel is connected to the pedal chain.

Primary Drive Sprocket
The Primary drive sprocket is bolted directly to the Nuvinci transmission.

Share your comments below:
What do say to the officer when he puts the red light on you?
Posted by John
03/01/2009 04:59:12 PM

You show him how this is a pedal vehicla with an added motor and hope he is a nice guy.
The legality of the Quad, or even trikes, with gas assist comes up all the time. Basically, you need to check with your state. The motor is a 33.5cc 4-cycle engine, which falls under the motor-assist cycle laws of most states.
Posted by Ashley

You are the Man!
I wanted to build almost xact!

Posted by PedalPower.ws
03/01/2009 05:58:55 PM

This is the pedalcar I've been looking for
I can't wait to put a fairing on it and sell the Honda!
Posted by Anonymous
03/02/2009 09:20:34 AM

Where can one put a a couple of bags of groceries?
I presume on the left side of the gear box and also ahead of the engine behind the seat on the right?
Where is the engine exhale the exhaust?
What kind of muffler is installed on the engine?

Posted by DJ
03/06/2009 01:52:28 PM

The gas motor setup takes most of our cargo area. We are working on a basket/cargo hold for the left side as well as a cargo cage/rack that will go up and over the motor.
There also is some area under the seat.
The exhaust is on the right side of the engine with about a 3-inch canister muffler.
Posted by Ashley

How much is the price
Posted by Loren lontz@cox.net
03/08/2009 04:08:39 PM

You can configure the Quad with a gas motor from our Quad Customizer.
Posted by Ashley

this is the nicest that I have yet to see, it has everything that a guy might want except a body, good on you.
Posted by Mr.G
03/17/2009 02:26:41 PM

Will there be an electric model anytime soon?
Posted by Don
03/29/2009 07:47:58 AM

We are currently working on one. A final version should be ready within two months.
Posted by Ashley

At last, all my procrastination and indecisiveness over purchasing one over a year ago has proven to be blessing in disguise with what seems to be the "final form" of the gas quad. But may be waiting for another two months or more will clear more cobwebs away ...
Posted by Zveloyak
04/10/2009 09:56:00 AM

It's ready to go! Just let us know.
Posted by Ashley

Could you easily make one of these with the 49cc GXH50 Honda engine that Staton also offers? What about the 100cc Honda GX100 engine? Or would that involve a lot more custom fabrication work?
Posted by Gary
05/09/2009 07:28:22 AM

A bigger motor would require a bigger axle and possibly a different transmission set. Our goal is to make pedal cycles with some assist, not necessarily small cars.
Posted by Ashley

Any more details on battery electric drive options? Most small gas engines have no emissions and spew 5x or more pollution than a modern car. Lots of battery assists being done by folks on BROL. Any chance to extend the wheelbase for a flatbed? Thanks
Posted by Ralph
06/24/2009 03:58:59 PM

We are working on an electric middrive system. It probably won't see completion until winter.
Posted by Ashley

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