Shimano Chain 116 links w/o end pin CN-HG901-11 11-Speed

Product Information

The way the front derailleur fires the chain from small ring to big is delightful. R9100-series Di2 was already phenomenally competent, and R9200 is just that little bit better. Dura-Ace R9200 is, as expected, showing signs of being an exceptionally good groupset. Max Wilman / Immediate Media Shimano has provided claimed weights for every component in the disc groupset, along with a comparison to an equivalent R9170 Di2 groupset.

Shifting is said to be smoother, too. R9200 cassettes use ‘Hyperglide+’, a design debuted with Shimano’s top-spec mountain bike groupset, XTR M9100. speed full-suspension mountain bikes require slightly longer chains. The difference is just one link. Here is Shimano's recommended sizing method for full-suspension bikes. If the point where the two chain ends meet is the beginning of an outer link, add two links (right image). We expected it to be at least partly wireless, and it is. We were sure it would be 12-speed, and it is. It doesn’t look like much has changed on the rim brake side. There’s still a choice of standard single-bolt calipers or direct-mount versions.In the past, Dura-Ace has been quite narrowly focused on the needs of road racers, with hardcore gearing to match. According to Smith, swapping out a worst-case scenario of the least-efficient chain lubricated with a particularly ineffective lubricant for a best-case scenario saves more than 10 watts (when testing at a 250w load). There you go! You should now be able to size the chain. If you need some chain tools, these are the ones I use:

This test reveals how lubricant and its friction changes over driven kilometres on a single lubricant application. The higher the number the more Watts you are losing. With “wet/semi wet” lubes friction first decreases because chain gets drier and therefore stiction decreases. Until it reaches more or less dry state – the friction then increases due to starvation of lubricant and abrasion. For “dry” lubes/films, stiction is already minimal, so they will only increase in friction due to coating wearing out. The shifter internals are dangerously exposed to the elements: the shifter internals are dangerously exposed to the elements James Huang Shifting performance – good overall but could be better However, Smith has used that data to develop his own 'UltraFast' chain, which is essentially the fastest chain he's tested (Shimano's Dura-Ace CN-7901) ultrasonically cleaned and treated with a blend of paraffin wax, pure PTFE, and molybdenum sulfide lubricants. This recipe produces, Smith says, provides the lowest consistently measureable frictional losses of everything he's tested. Each lever is powered by a CR1632 coin cell, claimed to last around 1.5 to 2 years of riding. Riders can choose to run their levers wired if desired, which apparently has the side-effect of increasing battery life by around 50 per cent. Shimano says it’s reduced the amount of free stroke in the brake levers and they now benefit from Servo Wave, which makes the relationship between lever travel and pad travel non-linear.Recently I returned to road bike and indulged myself with a cervelo S5 VWD. When selecting the components I went for SRAM RED all the way for the weight and being so impressed on how fast the shifting happened. The shifting from shimano dura-ace seamed slow and the handle less pleasant in comparison. With "at home" lubricating methods or ultrasonic application, you can achieve great results, if done correctly. But, this process is simply on another level of performance. Smith has also been investigating the effectiveness of chain lubricants. There, the results vary tremendously. In fact, Smith says one popular lubricant actually increases drivetrain frictional losses by five watts relative to the factory treatment. The R9250 rear derailleur can pair directly via Bluetooth with Shimano’s E-Tube app on a phone or tablet, for example, allowing for customisation of the groupset from the off. Despite the concealed housing’s additional bend, cable friction is only slightly increased over 7800’s more direct route. Add in Shimano’s typical Light Action feel and you get a slightly more vague and disconnected feel than before but rear shift performance is still on par with 7800 overall if not quite as crisp. Chain movement across the cassette, though, is impeccably smooth – aided in part by the new asymmetrical chain – and full-power shifts are as reliable as ever in spite of the curiously flexy carbon rear derailleur cage.

With development of the new groupset focused primarily on road disc brakes, the rim brake R9250 levers are not wireless.In contrast, Dura-Ace 7800 requires a 20-degree throw for both upshifts and single downshifts, so if anything, downshift throw on 7900 has gotten longer. Perhaps Shimano were measuring 7900’s throws from a vertical line? Either way, tsk, tsk.