Why on earth are there 2 bottle cage positions and where does the Di2 battery live now it doesn't fit in the seat post!? We pestered the Specialized Bicycles engineers to find out! cycling TarmacSL8
in the world right now. All the hype means we had plenty of questions about Di2 batteries, tyre sizes, wind tunnels and more so here are some of the lesser-known tech takeaways from the launch.
The UCI is quite strict about the external shape of the frame, but there are very few rules on what the bike can be made out of and how it’s laid up, so this is an obvious area to gain an advantage over rivals.Luckily for Specialized, the brand has access to a very powerful computer that does a lot of the simulating. Moving around more than 500 sections of carbon until after over 50 attempts, the engineers arrived at this final layup with the desired frame characteristics.
I also learnt that the paint on these S-Works models is done by hand! A red paint job adds about 50 grams to the frameset weight when compared to one in the satin colourway. One of the consequences of having a thinner seatpost is that a Di2 battery will no longer fit inside it if you're running a Shimano groupset. Cannondale, for example, has overcome this by using a bit of string to help you fish it out of the bottom bracket area when the time comes.
Supposedly the lower you mount your bottles towards the bottom bracket, the more aero it is - however, some riders, particularly those with shorter arms or less flexibility, might prefer their bottle a bit higher to make it easier to grab whilst riding, hence the two positions.
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