We originally designed a test bench for GOKISO products. This test machine is used to evaluate and analyze all GOKISO products and other companies' products. This test machine has a superior high resolution capacity enabling it to measure a slightest variation in aerodynamic drag between 2 different spokes. The graph shown below compares performances of 2 kinds of aero spoke. Aerodynamic drag of the spokes with larger cross sectional area (manufacturer A) becomes higher as the speed increases. Something more or better!

A Variety of comparison tests are done to choose the best carbon rim for GOKISO wheels. One of the rim comparisons listed below is "Clincher versus tubular". From our tests results, our clincher wheel shows less rolling resistance compared to popular tubular wheels. This big difference we believe, as our test data confirms, is caused by the difference of the structure of the rim, which produces a difference of deformation of the tire and rim assembly. As a direct result the difference of the contact area of the tire significantly affects the rolling resistance. As shown in the graph below, our optimized 38mm clincher wheel shows much less rolling resistance compared to full-carbon tubular wheels of other manufacturers'.

The biggest difference appears in a high load, high torque condition which is the most stressful for the bearings. In 100kg load conditions in which impact load is assumed the Gokiso Aluminum "Climber" wheel helped so many riders break their own bests times in hill climbs, as can be seen in the graph below.
Try hill climbing with GOKISO "Climber" wheels!

The test results as shown in the graph below confirm that for the rear wheel when using a a lightweight rim with a 24mm rim height greater traction loss caused by lack of rigidity of the rim. That's why we chose 30mm high rim for Gokiso Climber models rear wheel.
Currently 30mm wide Gokiso Climber series clincher wheels have not been UCI approved yet for front wheel use in UCI sanctioned races.(*) For those who are participating UCI races, we recommend using a Gokiso Climber series 30mm rear wheel and a Gokiso climber series 24mm rim for front to improve over all performance and comply with the UCI regulations*.
(Riders)Those who do not participate in UCI sanctioned races may run 30mm high Gokiso Climber series wheels in both front and back or in the 24mm front and 30mm rear.
The choice is yours!
* : UCI CYCLING REGULATIONS ARTICLE 1.3.018

The "Super Climber" employs a titanium alloy for the shaft and ceramic ball bearings which from our extensive study of a variety of material combinations we found to be the most logical for our high end model.
<Material Selection>
With the traditional "GOKISO" hub we studied whether the the number of rows of bearings (single or double), bearing size, adoption of ceramic bearings, and material of the shaft affect the over all hub performance or not. We found there was no significant difference in performance observed with "Traditional GOKISO" hub. Neither prototype "Super Climber" nor prototype " Climber" could surpass the Traditional "GOKISO" hub, when the same bearing layout and shaft material were used. However, our extensive studies, tests and design changes revealed that there is an optimum combination suitable for each model. Our flagship "Super Climber" exceeds the Traditional"GOKISO" hub in every aspect as shown in the graph below.

Have you ever experienced that the nipples of your wheels are damaged by corrosion? The nipple on the right, pictured above, is an Aluminum nipple that was used on a stainless steel spoke, and the nipple shown on the left is a new unused Aluminum nipple. You can easily see the nipple on the right is corroded. This phenomenon is called "Galvanic corrosion" caused by a difference of ionization tendency between Aluminum and stainless steel. Water and/or salt dramatically promote this phenomenon. We recognize corrosion of aluminum nipples as a serious problem that adversely affects safe bicycle riding.
We subjected all kinds of nipples to our salty water spray test(*) to check and evaluate corrosion resistance. The picture above shows nipples after 48 hours of the salty water spray test having been administered. Out of them all only the brass nipples showed the best corrosion resistance. We use 44 different nipples on our GOKISO wheel. Brass nipples weigh 44 grams, which is 30 grams heavier than Aluminum nipples. Despite the weight increase, we employ brass nipples because we believe our customers' safety is most important. Weights of the wheels shown in the spec sheet above are weights with brass nipples.

(*) salty water spray test: A type of corrosion test, in which the test article is exposed to salty moisture by spraying salty water inside an enclosed compartment. The temparature inside the compartment is kept at a constant of 35 deg. Celsius.