Hello everyone,
I’m currently riding a Specialized Crux in size 54 with two wheelsets. Since changing the wheelsets is extremely annoying, I’m thinking about buying a new bike. I took the Crux to a bike fitter and had it optimally adjusted. The bike fits perfectly. Since then, I’ve ridden 6000 km on it and taken part in many events, including Mallorca312. I never had any problems with the bike fit.
I contacted my bike fitter and he said that a size 52 might be better for the Tarmac. However, I am of the opinion that he is not quite right. With the 52 I would have to use some spacers under the handlebars, which I don’t like visually. I would also have less leeway for any later adjustments. With a 54 I wouldn’t need any spacers. In addition, the frame of the 54 is closer to the Crux, but the cockpit is not. I was recommended the 90x380 cockpit on the Tarmac.
If I calculate reach + stem + handlebar reach, the result is as follows:
Crux: 388 + 80 + 75 = 543mm
SL8 52: 380 + 90 + 75 = 545mm
SL8 54: 384 + 90 + 75 = 549mm
There is also a Roval cockpit with a 75mm stem, but I don’t think that would work.
Here is the comparison:
bike-stats - Alles zum Thema Fahrrad Geometrie Tarmac SL8_2024_54
Fitting data for my 54 Crux:
Stem length: 80mm
Seat height: 711mm
Cant: 45mm
Rear seat: 183mm
Seat length: 630mm
Seat length brake levers: 765mm
Crank length: 165mm
Handlebar width: 380mm
Handlebar reach: 75mm
Now to my question. Which size should I buy? I think both will fit.
