Longtime cyclists may remember that Di2 first saw the light of day in 2009 with the Dura-Ace 7970 10-speed groupset. This is one of electronic shifting’s biggest sticking points for me, specifically Shimano Di2 as it has been around long enough to be observable. I can accept a cycling computer, sensors, lights, and a power meter requiring batteries, but needing one for the bicycle itself is still off-putting. Stories abound of cyclists having dead derailleurs on a long ride because they had forgotten to charge up their bikes’ shifting batteries. If you take advantage of the “semi-wireless” option that 12-speed Di2 and FSA’s K-Force WE groupsets offer, you need additional coin-cell batteries at each control lever too. Most others require a beefier main battery, either externally mounted on the frame (as with older Di2) or hidden in the seatpost.
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On a fully wireless drivetrain like SRAM eTap, you need a CR2032 coin-cell battery at each control lever, plus one eTap battery per derailleur. CON: YET ANOTHER BATTERY TO CONTEND WITHĪs appreciative as I am of modern cyclist gadgets and conveniences, the fact remains that a huge percentage of these require batteries. The 12-speed Di2 groupsets, in particular, have integrated a lot of their circuitry into the rear derailleur, so if yours gets destroyed on a ride, prepare for a hefty hit on your wallet to replace it.
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A full Shimano 105 R7100 Di2 groupset is $1900 (PhP104,400) – that sort of money can get you a pretty spiffy built bike all on its own, albeit with mechanical shifting.Īlong with the price delta of the whole groupset is a price delta of the individual components themselves. Shimano 105 and SRAM Rival eTap AXS have definitely brought the price of admission down on electric groupsets. SRAM goes whole hog on this concept though and records your time spent in each gear, which you can nerd out on with their AXS smartphone app. Most electronic groupsets allow current selected gear data to be displayed on a cycling computer ( although Shimano has infamously retracted this for Hammerhead Karoo units). Unfortunately this is yet another omission for 105 R7100 Di2.
These can be assigned a custom function one frequent use is flipping through the data pages of a compatible cycling computer. Many folks have heard of the hidden buttons on the hoods of Shimano’s Di2 shifters by now. Interestingly, both Shimano 105 and SRAM Rival eTap AXS drop support for satellite shifters.
Shimano led the way here, with climbing shifters intended to mount on the bar tops, and sprint shifters meant to be thumbed while in the drops. Pros may complain that inadvertent shifts can happen while riding on the brutal cobbles of Paris-Roubaix, and winter cyclists may grumble about Di2’s shift buttons not being distinguishable enough from each other, but otherwise this is a net boon – and SRAM eTap’s “paddle shifter” shift ergonomics don’t suffer from these problems either.īecause shifting is now just a button operation, and there is no longer any physical shift cable and ratchet mechanism to account for, there is no reason why shifting has to be restricted to just the shift levers. Unlike with cable-shift control levers, where larger sweeps of the lever are needed to pull sufficient cable to shift to a larger cog, electronic groupsets basically have buttons controlling the shifting. PRO: LOW LEVER EFFORT + PERSONALIZED SHIFTER LAYOUT These days, you can do it via smartphone app. On older electronic groupsets, you press a button to enter a “fine adjustment” mode, then use the shift buttons to move the relevant derailleur cage millimeters at a time. If you do need to adjust the indexing, it’s often a pretty simple operation. Perhaps the only maintenance they need is periodic charging of their batteries, which, in the case of Shimano Di2, may be needed only a few times a year.įreedom from a shift cable also means an electric-shift groupset will never have its indexing go bad because of improper cable tension, since the derailleurs operate via servos and electric motors. Anyone who’s broken a shift cable inside their control levers will appreciate this being a total non-issue with electric-shift groupsets.
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