r100r(s or t or whatever...) to dual sport conversion

[acousticrawk]

Originally Posted by Airhead Wrangler

Don't think so. You need to machine down the center of the hub to fit on a monolever final drive. Doable, but not a quick and easy bolt-up.

Go look at part 4 here:
http://www.stephenbottcher.net/BMW/paraconv.htm

How about lacing a 4 lug hub to an 18 inch front rim? Seems easy enough?

[Airhead Wrangler]

Originally Posted by acousticrawk

How about lacing a 4 lug hub to an 18 inch front rim? Seems easy enough?

I suppose you could try if they use the same number of spokes, but you'll still have the issue of having to machine the hub to fit the monolever final drive.

[acousticrawk]

Originally Posted by Airhead Wrangler

I suppose you could try if they use the same number of spokes, but you'll still have the issue of having to machine the hub to fit the monolever final drive.

gotchya. i see that now (internet was down all day yesterday. well, seems doable. im still torn between dual shock and monoshock monolever. im really leaning towards monoshock. i havent decided if i like all of the electronics under the tank or not yet though. anyone have an opinion on the matter? going to start scoping out frames/bikes over the next week or two to make my decision!

[acousticrawk]

Found a GS subframe today and have officially started my pile of parts!

[Beater]

Originally Posted by acousticrawk

Found a GS subframe today and have officially started my pile of parts!

You really need to decide on the dual vs. mono-shock. The HPN guys attach the shocks to the frame ... so the GS subframe is necessary for both.

I will stress again, If I had it to do over, I would go for the dual shock ... reason being is that in the long run, parts are more plentiful, and it will be cheaper to acquire them.

But I agree ... the mono-shock looks cooler

[acousticrawk]

Originally Posted by Beater

You really need to decide on the dual vs. mono-shock. The HPN guys attach the shocks to the frame ... so the GS subframe is necessary for both.

I will stress again, If I had it to do over, I would go for the dual shock ... reason being is that in the long run, parts are more plentiful, and it will be cheaper to acquire them.

But I agree ... the mono-shock looks cooler

my boss seems to think he has a GS frame somewhere, if thats the case, I will go mono shock because finding parts at a fair price wont be to big a problem for me. if not, then i will go with a dual shock. not only does mono look cooler but i think it rides better too, and i like the ease of rear wheel removal which is nice if you have a puncture.

[acousticrawk]

My next question is... Why lengthen the swing arm? The stock monolever arm was the same length as the g/s arm right? Once the tube in lengthened, how do you lengthen the driveshaft? Or does another bike have a longer arm and shaft?

[Beater]

Originally Posted by acousticrawk

My next question is... Why lengthen the swing arm? The stock monolever arm was the same length as the g/s arm right? Once the tube in lengthened, how do you lengthen the driveshaft? Or does another bike have a longer arm and shaft?

All Dual shock ad mono bikes have the same swingarm length. All of the shafts are interchangable. The paralever is about 4" (100mm) longer.

Grab a tape measure and go to a bike night. Measure the wheelbase of any modern 'dual sport' bike in the lot. You'll see that the BMW is anywhere from 4" to 8" shorter. Extending the swing arm does more for the smoothness of ride than increasing travel. It will also move the venter of gravity towards the front end, and you'll find the bike is a bit more balanced.

Just one man's opinion of course, but you can (and should) ride it with the standard rear end for 5K miles. just to see what its like.

[acousticrawk]

Originally Posted by Beater

All Dual shock ad mono bikes have the same swingarm length. All of the shafts are interchangable. The paralever is about 4" (100mm) longer.

Grab a tape measure and go to a bike night. Measure the wheelbase of any modern 'dual sport' bike in the lot. You'll see that the BMW is anywhere from 4" to 8" shorter. Extending the swing arm does more for the smoothness of ride than increasing travel. It will also move the venter of gravity towards the front end, and you'll find the bike is a bit more balanced.

Just one man's opinion of course, but you can (and should) ride it with the standard rear end for 5K miles. just to see what its like.

right on. I went and measured some swing arms from the r80st and the later mono shock monolever r100rt and they are all the same. shock mounting point is different though! im assuming the three lug (monolever) rear end will bolt onto any monolever then? I get how to extend the swing arm, basically just cut it on a band saw and weld in more tube. how do you safely extend the driveshaft and at what point do I need to start worry about binding the ujoint?

[Clay Spinner]

Sounds like a great project... but so that you don't go down the wrong road... I'd start using the search function and read everything you can .... there is a lot to digest and decisions to make. As always... there are pros and cons to everything. I find that deciding what I want is the hard part... once you have that cracked you can narrow down your literature search. Gd' luck and I look forward to watching your build progress. HERE is a start...

[acousticrawk]

Originally Posted by Clay Spinner

Sounds like a great project... but so that you don't go down the wrong road... I'd start using the search function and read everything you can .... there is a lot to digest and decisions to make. As always... there are pros and cons to everything. I find that deciding what I want is the hard part... once you have that cracked you can narrow down your literature search. Gd' luck and I look forward to watching your build progress. HERE is a start...

awesome! thanks for the link! yeah ive been searching a ton and using this thread, which will become a build thread in good time to ask my more direct questions that seem to get beat around the bush a bit in some other threads. the questions im trying to ask in here are so that i can get answers from people with first hand experience and less what they saw or heard something someone may have done. great link though! thanks!

[acousticrawk]

Update time!

here is my early tentative list/plan:

- 40mm Head 100 Engine w/ skid plate and oil cooler
- Monolever/monoshock frame
- GS or G/S sub frame modified to fit
- Plastic or GS fuel tank (for longer range)
- GS or Suzuki DR650 front end with 21” wheel
- Seat? (Something that fits or will modify to fit, must be able to 2-up)
- Final drive that will work with an 18” spoke rear wheel
- Old school wide off road handle bars with heated grips and bark buster
- Minimal weight/electronic/wiring/emissions
- Single side exhaust
- G/S or other longer rear shock
- Small light crash bars with one flood/fog light
- Large Dual beam off road style headlight
- Cheap plastic dirt bike front fender
- Cheap rear fender or front fender that can be modified to fit rear
- light cheap saddle bag mounts.

Priorities
1. Reliable
2. Practical/Functional
3. Powerful
4. Unique
5. Use as many used parts as possible to “recycle” and to save money, which is practical ;)


thoughts suggestions?!

[acousticrawk]

anybody? i went from a few people chatting me up on this to none about over night. haha.

[Clay Spinner]

There is currently an r80 g/s ohlins on ebay in germany if you are interested!

[acousticrawk]

Originally Posted by Clay Spinner

There is currently an r80 g/s ohlins on ebay in germany if you are interested!

there is also one on the shelf in my work taken off of a cannondale supermoto i was told. looks like itll fit too! ;)