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Well-run equipment, professional sales team, and better after-sales services; We are also a unified big family, everyone stick to the company value “unification, dedication, tolerance” for 17t Bicycle Rear Derailleur Pulleys Wheel, Bike Rear Derailleur, Full Carbon Fiber Cages, We always insist on the management tenet of “Quality is First, Technology is Basis, Honesty and Innovation”.We are able to develop new products continuously to a higher level to satisfy different needs of customers.
Bicycle Rear Derailleur Pulley Road Bike 17TS For Shimano
Product description
*17T large size guide wheel set system
*17T pulleys or16T pulleys
*Saves 60% chain friction resistance compared to 11T guide wheels”
*Ceramic bearing version saves more than 2.4 watts of average power compared to the original shifting system
*Full carbon fiber cage
*Full 7075 aluminum alloy CNC cutting lightweight guide wheel and shaft pin
*17TS is suitable for Shimano 5800/5700/4700 /4600 105/Tiagra
*Ceramic Bearing Version Stainless Steel Hybrid Ceramic Bearing Version Steel Bearing Version
*Weight: 71.4g
*The ceramic Bearing version is 1.2 grams lighter than the steel Bearing version
*Shifting speed increased by 20%-26% for Shimano systems.
*Color: Anode red, enamel, blue, gold, green
*Support up to 11-28 cassettes, compatible with 11-30 and 11-34 with the help of an RD extender.
This is the fastest RD pulley system.
17TS & 17TR installation tips:
1, due to increased offset by the oversized pulley system, please make sure your RD and frame are aligned and calibrated correctly.
2, please check the length of your chain. Here is how to calculate, chain should be 10-20mm longer than the RD at 0 tension (shown as the picture below) when rests on the smallest chainring and smallest cog.
3, to lower the requirements for chain length and RD/frame alignment, we introduce the new 16T pulley system, 17TS and 17TR. Compare with 17T, the power saving would be lowered by about 0.2 watts but increasing chain stability and shifting speed.
Why replace derailleur pulley wheel
Firstly, porous spring position limit could adjust back tension largely, improve the weakness of original weak stretch, and make the up and down chain tension between guide wheel and cogs much more adequately.
Secondly, the contact tooth number or control tooth number between chain and cogs of rear derailleur 17T is more during gear shifting, it just like to pinch the middle and two sides of some sticks, the larger the control lever, the stronger the control power.
Lastly, after redesign the cage’s rotation curve, the distance between upper guide wheel and the cogs is improved.
Installation steps
1.Remove the rear derailleur pulley wheel cage: Remove a hex screw on the side of the base of the pulley wheel cage using a No. 2 hex wrench. (The original pulley wheel cage has been removed in the photo)
2.Remove the hex screw, take out of the original pulley wheel cage and spring. (The original pulley wheel cage has been removed in the photo)
3. 17T carbon fiber pulley wheel cage, you can see 8 holes, marked in 1 to 4 is tension adjustment hole, the other four for reduce weight. The default initial mounting is hole 2. (tension: 4>3>2>1)
4.Install the selected spring mounting holes at the spring pins. The stainless-steel shaft on the pulley wheel cage should be greased before installation.
5.Push the pulley wheel cage into the hole of rear derailleur.
6.Rotating pulley wheel cage, setting pulley wheel cage rebound limit screw block in the rear derailleur.
7.Push the pulley wheel cage fully into the base of the rear derailleur.
8.Insert the hex screw into the hole on the side of the base of the rear derailleur using the No. 2 hex wrench.
9.Tighten the screw.
10.Repeated rotation pulley wheel cage, confirm the rebound smoothly, the installation is complete.
According to test result, increase the rear derailleur pulley wheel size could significantly decrease the friction between the chain plates caused by polygon effects during chain bending, and reduce the resistance for saving rider’s cycling power.
The chain is composed of several short pieces with an inch long, we could see the chain as one inch long with around one hundred and ten section lines, due to small diameter of turning circle, when the lines pass through standard 11T pulley wheel, it needs a certain angle to turn the transferring direction of chain for about 180° through two wheels, after increasing the pulley wheel size, the chain turning angle are decreased, so the loss of friction is less correspondingly. The results shows that 17T is a good balance point between weight and decreasing the polygon effects, To increase the size blindly will lead to arc decreasing not obvious, together with weight and volume adding. Compared with common 11T pulley wheel, the friction loss caused by polygon effects of chain could be decreased about 60%.
Besides, under the same transferring speed of chain, the axis rotation speed of 17T is slower for saving the self friction loss during bearing rotation, smaller cycle could also reduce the resistance of each turn rotation. To upgrade this ceramic bearing saves more power loss.
Faster gear shifts. firstly, porous spring position limit could adjust back tension largely, improve the weakness of original weak stretch, and make the up and down chain tension between guide wheel and cogs much more adequately.
Secondly, the contact tooth number or control tooth number between chain and cogs of rear derailleur 17T is more during gear shifting, it just like to pinch the middle and two sides of some sticks, the larger the control lever, the stronger the control power.
Lastly, after redesign the cage’s rotation curve, the distance between upper guide wheel and the cogs is improved.
And we should also tell customer that the compatibility of 11-28T cogs, the length of chain is within the range of 405-410mm standard road bike chain stay, suggest using more than 114 links, but not too short chain, or it might lead to too large back tension and enlarge the tooth tip resistance between chain and pulley wheels. (In case customer just has short chain, suggesting install it to lowest tension of spring mounting hole).
It can faster SHIMANO system up and down gear to improve 20%-26%. save 2.4 watts more.
