fit racing bike tips - Discover the right fit of a Specialized Tarmac SL8 for a cyclist with a height of 170 cm.


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Bike model


Crotch height

Arms length

Racing or amateur position

Current bike and size

Any problems with the current bike and size


Hi Luca,

I would gladly receive indications of the right size of the new bike I would like to buy.


Bike model: Specialized Tarmac SL8

Height: 170 CM

Crotch height: 79 CM

Arms length: -

Racing or amateur position: --


The correct size of the Specialized Tarmac SL8 racing bike is 52, 54 is too large and can only be taken into consideration in the presence of a professional cyclist's riding position with high trunk flexibility and excellent training.

Since you are not a professional, I believe that the best choice is to purchase the size 52, to which possibly add an 11cm attachment instead of a 10cm one.

This may not even be necessary if you prefer a less forward-leaning torso position.

By eliminating the thicknesses under the stem and using a 10cm stem, it would already have a good fit in the saddle, if it then combines an 11cm stem it will have a typically racing set-up.

At a size 54, he may be forced to put a size 10 binding and some shims under the binding.

In theory neither size is perfect for her, but the 52 allows her to make fewer changes and have a more balanced and aesthetically pleasing frame.

Excellent choice and excellent racing bike.