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Para lever length change?


chasgrips45

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I recently got a Email from Hornig with some after market offerings . I noticed that they make a para lever strut for the R1100rs,R1150rs,that is 20mm shorter than stock. I guess it reduces the wheelbase of the machine. Has anyone tried this shortened strut? How would it effect the handling of the bike? I know that shortening the wheelbase will make the bike a little more maneuverable,but does it really make a difference? Or is it an answer to a question unasked.

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The para strut sets the rear ride height, not the wheelbase per se. A shorter strut quickens sterring, making the bike more flickable. The stock strut has been set for stability (liability?) reasons and fitting a shorter one makes the bike much more nimble at the expense of some straight-line stability. A few years ago I saw an adjustable strut fitted to a Boxer Cup bike, allowing the rider to 'set-up' the suspension for different tracks.

 

Andy

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I recently got a Email from Hornig with some after market offerings . I noticed that they make a para lever strut for the R1100rs,R1150rs,that is 20mm shorter than stock. I guess it reduces the wheelbase of the machine. Has anyone tried this shortened strut? How would it effect the handling of the bike? I know that shortening the wheelbase will make the bike a little more maneuverable,but does it really make a difference? Or is it an answer to a question unasked.

 

chasgrips45, it might be worth a try.. Some older magazine tests of the BMW paralever fitted with a shorter (how much I don’t know) strut seemed to impress the writers & in most cases got a good review..

 

The shorter link will alter the rear U-joint angle (for better or worse I can’t say) but the original U-joint ft/rear matchup isn’t that great anyhow..

 

The shorter link will also change the parallelogram pivot points & change the jacking properties somewhat (again better or worse I can’t say)

 

It wili raise the rear enough to effect the turn in (I presume for the better but not riding the mod myself can’t say for sure)..

 

I made a similar change to my Ducati (different rear suspension but similar directional change) & it REALLY helped the turn in & cornering..

 

Added: -- If the link changes the rear height enough it could effect the side stand & center stand functionally so be sure to ask if that is a possibility..

 

Twisty

 

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The R1100S guys use a torque arm from a GS to shorten the wheelbase and increase ride height. It really transforms the R1100S. In fact, the Boxer Cup Replicas come with the shorter torque arm. You can probably pick up a used one from the advrider site for a few bucks. If it doesn't work, sell it to some on the pelican parts board.

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I checked & see that the GS paralever arm is 365mm,while the RS is 385 mm. I can also see that it would raise the ride height of the bike ,& when using the side stand might make the bike lean too far. I also wonder what kind of strain it would put on the u joint?

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clip~ I also wonder what kind of strain it would put on the u joint?

 

 

chasgrips45, it shouldn’t place any more actual load on the rear U-joint but will effect the front to rear U-joint angle cancellation.. I’m not sure that is even such a big deal as the original U-joint angle cancellation is not that well matched on the BMW R bikes anyhow..

 

Twisty

 

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I have an R1100S and changed to the shorter GS torque and I wouldn't go back. The steering is quicker and I don't notice any less stability on Interstates at speed. The bike does lean more on the side stand which makes it harder to get upright when fully loaded, but more of a problem is the fact the now the center stand doesn't completely lift the tires off the ground. If there's any slant to the ground surface, I put the bike on the side stand.

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I checked & see that the GS paralever arm is 365mm,while the RS is 385 mm. I can also see that it would raise the ride height of the bike

 

It might mean you're even more on tippy toe!

 

Andy

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Get an Ohlins shock with adjustable length. You can set the ride height at any level and you have a much better shock. My R1100RSL is raised about 20mm and it improves response and ground clearance. However, the first thing to touch down in corners are the valve covers.

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