Loving Shimano’s Di2

Cervelo S3 Shimano Adamo ASM ShimanoI finally managed a decent ride with the new bike yesterday.

The main purpose was just to see how well, or not, it rode; as well as sneak in a few easy sprints. However with a couple of mates in tow it turned into an hour of ‘off-plan’ fun and we came back significantly more tired than had we kept with our original intentions.

I still have not got a bike fit organised yet and I need to do that as I think I have messed up on the stem length. I’m having to reach just a little too far for the shifters. Plus I’ve not had one for a couple of years and suspect that I’m generally a bit more flexible so it seems prudent to get all the measurements dialled in before starting training in earnest for the season ahead.

The frame (Cervelo S3) and wheels (Shimano Dura Ace) seem a good combo and with slightly wider tyres than I’d normally go for the whole feel was generally one of comfort.

The first real foray into the Di2 shifters exposed my lack of experience in that respect and my brain seemed to be hard-wired into using the gear buttons/levers to go in precisely the opposite direction than road conditions dictated. The great thing is (might be) that I can re-program the shifters but I probably won’t do that. I probably WILL, however, have a play at the synchro-shiftig allowing one button to control the whole up-down gear changing process.

The best thing with the Shimano Di2 was the silence. Unlike with my oval chainrings on other bikes there are zero annoying noises from chains slightly rubbing the front derailleur. Apparently the gears are auto-trimmed to avoid such noises – let’s see how that pans out over time.

From a performance perspective the electronic shifting definitely meant that I shifted gear more often. It’s just a fraction less of a faff to shift gear. But that tiny fraction seemed to make a difference to my propensity to wnat to change gear. Theoretically, more frequent (correct) gear changes should be better for performance.

I’ve not yet put the D-Fly unit in (boring, long story) so I just have simple electronic shifting rather that the full-blown battery/gear status on the Wahoo, smartphone app integration and the ability to move the wahoo screen from the button on top of the shifters (the button is, kind of, shown in the picture above).

Then another half an hour faffing around with a carbon brake pad on another bike. How difficult can it be to change a brake pad? Answer: 30 minutes or more required to find numerous tiny allen keys/wrenches and then have to get the exact right adjustment to allow the wheel to fit without the need to file the pads down. Sorted. Eventually.

I have the aerodynamic blades on a borrowed wheelset. Cool. They definitely look more aero and go really well, visually, on the TT bike. Apparently people are now putting beads of silicon sealant between the rims and tyres for a similar effect as these aero blades which, I believe, are not UCI legal any more. The things people do.

MAVIC CASMIC CARBONNE SL CXR60 CXR80 front rear comaprison

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2 Comments on "Loving Shimano’s Di2"

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Two things…

– if you need to go shorter than 100-110mm with you stem, your frame (to be correct: the reach of your frame) could be possibly too long; I hope not. Long enough stem length is important for good ride feeling, especially when riding at ‚higher‘ speeds with a road bike and/or ‚deep section wheels‘.

Try to find a good fitter, like this guy (https://www.youtube.com/channel/UCr43Lgwqryq_QM00L1xJb4A), but in your area. Nowadays there are so many so called ‘bike fitters’ who are not worth a penny.

+ Di2 rocks! ?

Via di2stats.com I have seen that I shifted on average every 9-12 seconds – even on a 200k ride. But the area where I am is quite heavily ondulated.