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If there’s one thing I know, its I don’t know sh*t when it comes to the finer points of conservation of energy while pedaling bikes. Need some bike experts to chime in here with some expert analysis on this Kickstarter project for The Rinsten Spring shock absorbing bike seat ($49.99 Retail). If you love riding bikes but hate having a sore backside, this little gadget is looking pretty appealing.
Here’s their pitch:
“Rinsten Spring is a bike shock absorber. It offers you comfort during cycling and keeps your body healthy. Forget the sense of discomfort caused by vibrations when riding on uneven terrain or potholes. Whether you open season riding a bike after a long pause or just regularly bike around town, our Spring will minimise annoying bumps and vibrations that plague all cyclists.”
1. Comfort
This shock absorber makes your cycling comfortable and keeps your body healthy. 
2. Health
Our system damps vertical impacts and vibrations and adjusts to pelvis bending during cycling. Thanks to our spring your back literally “sticks” to the seat and doesn’t shift. This allows you to apply less effort when riding and avoid injuries.
3. Rinsten Spring absorbs shocks in three dimensions
4. Rinsten Spring works perfectly on any road
It makes your ride comfortable on all surfaces – from tarmac to hill path, pave stone or gravel.
5. Rinsten Spring is suitable for almost all bicycles
6. Rinsten Spring is suitable for everyone weighing up to 150 kg (330 lbs)
7. Easy installation & adjustment
You can adjust it in just 1 minute without any additional components.
8. Great position for every type of ride!
You can easily switch between sport and city positions in just 1 minute.
9. Unconditional Lifetime warranty
Produced of high-quality steel and aluminum, Rinsten Spring is a maintenance free product that consists of only five parts. You will get an unconditional lifetime warranty for our shock absorber!