• If I were making the decision I'd look at other frames/bikes. The reach (386mm) on the smallest frame would be too long for you, not to mention the low stack height.

  • Thanks for the reply - really appreciate it.

    Can I ask how you come to this conclusion - for reference; I went and took a ride on a Pinnacle Arkose today - 51cm (size M).

    According to their size guide this has a stack of 590mm and a reach of 387mm and it felt ok. The seat seemed to be at an ok height (see setup).

    I plotted some details in thebikelist bike fit and it popped out the numbers of 558mm stack and 365mm reach. This compares with an XS sized Ribble CGR AL.

    Sorry for all the questions - just want to get the right bike.


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  • Bear in mind the Pinnacle is designed to be ridden with a shorter stem (70-90mm), compared to the other whom have a more traditional fit (90-120mm).

    Hence why top tube is longer on Pinnacle.

  • Ed. is correct about the longer top tube/shorter stem combo trend on the Pinnacle.

    Your numbers you listed are around what I was thinking for your height and inseam (arm length can be played around with a bit with stem length); at least 560mm stack / reach around 370mm+.
    Going back to that Vitus, the stack height on that frame would be too low for you across the sizes.

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