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Bike Sizing (geometry)

Hi All,
I recently had a bike Boardman MTX 8.8 (2019) size L with the following characteristics seat post length is 54cm, top tube 61.5cm reach 42.6cm, stack 65.1cm. which fits perfectly for me.

So now I'm looking to get the the same model but new 2021 version in the same L size.

I have compared the geometry and looks the the new version size L has a different geometry
Reach is 43.5 and top tube (effective) is 63.5, and their M size is seat tube 49, stack 62.5, reach 41.9, top tube 61.

So the question is will I notice a difference if I go for size L? Or shell I go for M which has quite close geometry to the L size I currently had. Shell I go for slightly bigger geometry or smaller? Which will feel more familiar?
Thanks

Posts

  • wongataawongataa Posts: 883
    Draw both options and your current bike using the full geometry numbers and overlay them to compare. You can do this online. Remember to include the stem and handlebars to make sure you can get them in a similar place to that of your old bike.
  • wongataa said:

    Draw both options and your current bike using the full geometry numbers and overlay them to compare. You can do this online. Remember to include the stem and handlebars to make sure you can get them in a similar place to that of your old bike.

    Do you know on which web site o can do that? That would would be really helpful. Thanks
  • wongataawongataa Posts: 883
    rsmrnd61 said:

    wongataa said:

    Draw both options and your current bike using the full geometry numbers and overlay them to compare. You can do this online. Remember to include the stem and handlebars to make sure you can get them in a similar place to that of your old bike.

    Do you know on which web site o can do that? That would would be really helpful. Thanks
    A quick Google found these:
    https://bikegeocalc.com
    https://bicyclecalculator.co.uk/createamap.htm
    bikegeo.net/
    https://99spokes.com/
  • If you’re between sizes, the smaller one will be more responsive, the larger one will feel more relaxed. Judge it on your riding style and preferences.
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