I’ve been making and reupholstering seats for about 40-years. I never could find an aftermarket seat or add-on pad that worked for me. Many gave me a little more comfort or more accurately gave me a little more time before the pain set in.
In ‘06 I bought an ‘04 BMW, R1100S. It had/has (still riding an ‘04 BCR) the hardest, worst contour seat I have ever ridden.
I could stand only 75-miles. 100-miles was torture. I developed a variable-pressure air pad for it.
The first version was made from a hunter’s tree stand pad which is filled with porous and permeable foam and has a valve allowing more or less air to be added to supplement the foam’s cushioning.
To this valve I grafted a Camelback drink tube. The Camelback has a mechanical lever-valve. The hose is long enough to reach the left grip’s cluster.
Riding on the seat is very comfortable. Now I am able to do 700-mile days. I believe the reason the pad is so comfortable is that the variable-cushioning allows for changing the contact patch size and location. But even more important is that the top surface of the pad moves laterally through 360° while the bottom surface sticks to the seat. This eliminates the shear normally happening to one’s butt.
A drawback is it is very much like standing on a beach ball. The triumvirate of feet, butt and hands is lost. And with this goes some control. Coupled with making the seat taller (the BCR is very tall), serious tiptoeing is necessary.
That the seat is adjustable from the left handlebar allows for complete deflation quickly. This allows better maneuvering at any speed.
The foam will self-rise with the valve open and no weight on the pad; standing on the pegs. I added a blow tube upstream of the valve lever making it possible to blow air in to quicken the fill and to add more air than the foam expanding can provide.
For the second version I used a Thermarest pillow in a Gore-Tex sleeve with a seat strap. It’s a cleaner look and the pad’s footprint is smaller.
I’ve also found I could push the pad aft with my butt and be able to sit directly on the bike’s seat for maneuvering without deflating the pad.
Version 3; a 12vdc powered air pump-controlled pad I will probably never fabricate for the simple reason that the manual-version works fine.
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