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No, Ethan Hayter's dropped chain wasn't due to 'Shimano shifters'
It was a mechanical that brought heartbreak to Ethan Hayter’s Worlds time trial on Sunday. Just under halfway through his effort, the young Briton crested the final climb of the lap, went to shift into his oh-so-big 58-tooth big ring, and then ended up with a tangled mess. Hayter went on to finish the rest of the course with a subtly different (and arguably slower) bike, and ended a painfully close single step away from the medals. Not a great gift for the birthday boy.
As reported by Cyclingnews, a rightfully upset Hayter spoke to reporters after his race, explaining the cause of the dropped chain. “Shimano don’t make chainring shifters on the new gears,” he said. “I was trying to change chainrings and it wasn’t quite shifting, and I pressed it again and it dropped off.”
While it doesn’t change the shituation for Hayter, race footage suggests the blame should be pointed at something other than the Shimano Di2 shifters. As you can see below, Hayter tries to shift the chain, then there are multiple seconds of the chain grinding as it fails to be picked up onto the big ring, and then it jams. Throughout this process, you can see Hayter trying to use the derailleur to reset the shift, but the chain is already too far gone.
Those familiar with Shimano Di2 will know it’s a rather robotic system. When set up correctly, a press of the button prompts the derailleur to move by a pre-configured amount. No amount of pressing or not pressing the buttons will change how it shifts – that nuance and finite control is taken away from the rider. Furthermore, Hayter’s bike was being looked after by the usual and highly experienced Ineos mechanics, and so it’s highly unlikely that the adjustment was wrong – that machine would have been dialled.
In my opinion, the blame rests solely with the use of non-standard chainrings and the gear that Hayter was in at the time. Hayter was using what appear to be unbranded and perhaps custom (round-shaped) AeroCoach ARC Dual TT carbon chainrings in the 44/58T size on a Shimano R9100 crank.
Along with offering substantially larger sizes than what Shimano offers aftermarket, these full-carbon constructed chainrings are claimed to provide an aerodynamic advantage and friction benefits.
Now Shimano is well regarded for its front shift quality and consistency, and a big part of that is related to its stiff chainring design and intricate ramps that help pick up and guide the chain between chainrings. AeroCoach’s design does offer four pins and guides to assist with shifting, but they’d be pretty basic compared to authentic Shimano.
Perhaps more telling though, is the following warning from AeroCoach’s website. “Cross-chaining in the inner ring (using small sprockets at the back of the cassette along whilst in the inner ring) is bad for the chain, bad for efficiency and will result in poor performance. Using an ARC DUAL inner ring in combination with the 4 smallest sprockets on the cassette is not recommended.”
And that line from the chainring manufacturer points strongly to the problem. At the time of the incident, the footage points to Hayter spinning an extremely fast cadence while in the smaller sprockets of the cassette. This could very well result in the teeth of the big chainring getting in the way of the shifting pins, or worse, catching and jamming the chain – especially given the speed at which it was all turning.
As for why Hayter was using those carbon chainrings, that seems to be all about the goal of marginal gains and not one of bigger gear selection. Hayter’s bike appears to be unchanged from what his trade team, Ineos Grenadiers, typically take to important time trial stages. A representative from Shimano told CyclingTips that the company supplies Ineos with special 58T-sized chainrings – just not wholly sealed aerodynamic ones like what was used on Sunday.
And right there is the all-too-common trade-off associated with marginal gains in tech. All too often, those small gains introduce real-world tradeoffs. Sometimes they result in glory. Other times they leave a rider with shattered dreams.
Read MoreBy: Dave Rome
Title: No, Ethan Hayter’s dropped chain wasn’t due to ‘Shimano shifters’
Sourced From: cyclingtips.com/2022/09/no-ethan-hayters-dropped-chain-wasnt-due-to-shimano-shifters/
Published Date: Sun, 18 Sep 2022 23:51:01 +0000
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