Reverse Trike

[HydroJim]

If you were to build a reverse trike car with the engine in the front and front wheel drive, how would you handle the rear wheel? It needs to have a functioning hydraulic rear brake and a manual parking brake.

Here is what I've come up so far:


By using the rear wheel assembly from the donor car, I can be confident that the brakes and emergency brake will be easy to assemble and I won't run into any problems.

[groundflyer]

Originally Posted by HydroJim

If you were to build a reverse trike car with the engine in the front and front wheel drive, how would you handle the rear wheel? It needs to have a functioning hydraulic rear brake and a manual parking brake.

Here is what I've come up so far:


By using the rear wheel assembly from the donor car, I can be confident that the brakes and emergency brake will be easy to assemble and I won't run into any problems.

Look at youtube reverse trike alot are that way

[HydroJim]

groundflyer- How are you planning on handling your rear brakes? I would like to use a motorcycle frame because i would save time, I'm just not sure how the brakes would work out.

[groundflyer]

Originally Posted by HydroJim

groundflyer- How are you planning on handling your rear brakes? I would like to use a motorcycle frame because i would save time, I'm just not sure how the brakes would work out.

My bike frame is older with just a rear brake by foot so it will be a E brake
If you use a newer bike with hydrolic disk and just plug the car brake system and bike may need a different proportioning valve.

[HydroJim]

Maybe using a bike the same as or similar to yours is the way to go.

How do you think braking will be with only the front brakes?

[cRiPpLe_rOoStEr]

It doesn't seem so complicated to set up the rear brake, would just need to block one of the rear brake lines at the master cylinder and remove one of the E-brake cables at its assembly...

[HydroJim]

so if I were to use car rear parts, how would I be sure that the rear end is strong enough?

[some_other_dave]

"Strong enough" begs the question of how much strength is actually needed. Is your reverse trike going to be significantly lighter than the four-wheeler you are using the parts from? Presumably it is, but you would need to make certain.

If the rear wheel carries the same load as one of the two rear wheels of the four-wheel setup, then the stock parts (hub, bearing, etc.) should be quite strong enough. The swing-arm needs to be strong; the design you show could provide enough strength, but you will have to make it out of the right materials and brace it properly and so on. Lots of details that will make or break it.

For brakes, you will need to re-engineer the system to at least some extent. The car parts will be set up to push enough volume for two front brakes and two rear brakes. There will be two brake circuits, either one feeding the front and one the rear, or with each feeding a diagonal (LF/RR versus RF/LR). When there is only one rear brake, the volume that one circuit has to move will be significantly different. You also have to consider proportioning; if you have too much rear brake bias the rear will lock up first, which will tend to make the rear of the vehicle try to become the front of the vehicle.

So you will have to address the brake system pretty carefully and work through the volumes and pressures with some care.

Even if you put both rear brake calipers on the single wheel, you should get a lot more clamping force for a given pedal pressure on that one wheel than on two wheels. So you would want some sort of additional proportioning mechanism...

I know that there are racing parts that can be used to limit the brake line pressures going to at least one circuit; possibly there are ones that can work on two circuits (for the diagonally-linked brakes).

Unfortunately, it is not as simple as it looks at first. Plan on a good bit of testing...

-soD

[cRiPpLe_rOoStEr]

Originally Posted by some_other_dave

"Strong enough" begs the question of how much strength is actually needed. Is your reverse trike going to be significantly lighter than the four-wheeler you are using the parts from? Presumably it is, but you would need to make certain.

If the rear wheel carries the same load as one of the two rear wheels of the four-wheel setup, then the stock parts (hub, bearing, etc.) should be quite strong enough.

That's particularly critical. Anyway, it might be not so hard to get some parts from a heavier vehicle. Considering a Civic as the base car, rear wheel hub and bearing out of an Accord can work. Another vehicle worth to take a look is the Volkswagen Transporter T4, which was more widely available in Canada and Mexico: it doesn't have a rear axle in the 2WD versions, it has 2 swing-arms instead.

[Christ]

Rear hub from a mid sized 90's GM, has caliper with cable lock attachment point on it. Just take the while rear spindle from a donor car.