Bike fit / correct riding position

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  • Internet bike fit doctors, who has any knowledge of numb toes? Some of the toes on my left foot go a little numb after ~20mins of riding (road bike). I don't get this issue on the turbo (TT bike). Cleats set as far back as they go and have been like this for at least 4 years.

  • That's the opposite of what I have, which is good news for you although I don't know what would cause it. You're using the same shoes on both bikes? What pedals?

  • Just to rule an easy one out, how tight do you fasten your shoes before riding? Feet tend to swell a bit during the ride and can lead to numb toes

  • Yeah it's weird. Same shoes, which I've been using for the past year now. Both bikes SPD-SL. My last bike fit uncovered no leg length discrepancies.
    Different saddles between the bikes though; TT bike has a Fabric TT saddle and road bike has an Aerocoach Axis saddle. The latter has little/no gooch channel so maybe I'm trapping an artery or nerve somewhere? Maybe I'll try a Fabric TT saddle on the road bike...

  • Just to rule an easy one out, how tight do you fasten your shoes before riding?

    Yeah good point. I didn't think I tightened them down too much, maybe I am as I hate a sloppy shoe fit. I did find a Reddit thread with someone who had the same issue and the same shoes (Pearl Izumi Elite Road 4), who thought the Boa wires over the top of the foot could have been causing the issue. But then again, I've been using these shoes for the past year without issue, until now.

  • That's the only thing I could think of. But I have no idea about human anatomy so don't know if feet nerves travel near your butt. Nurse!

    I get numb left leg (feet) on the TT bike but that's because I've done a naughty on myself with Iliac artery endofibrosis and some nerve damage. Hot tip kids, don't spend years of your life riding a TT bike up and down DCs.

    There's definitely nerves running in front of the hip that might impact the feet - which is why it's a bit weird you get this on your road bike and not TT bike, but perhaps there are other nerves on the back side that can have the same impact?

    Or maybe the different saddle causes a different pedaling technique and so the foot pressures are different somehow?

  • I was working under the assumption that you'd ruled out the obvious "shoes too tight" issue, plus you don't get it on one bike but do on another - would you tighten shoes differently between bikes? Why, weirdo?

  • Yeah there's no reason why I would wear shoes at varying levels of tightness between bikes. One thing I forgot to mention is that the numbness seems to subside when I'm out of the saddle. By process of elimination it sounds like this could be a saddle issue...maybe...

  • Sounds like it doesn't it.

    Check it: https://www.innerbody.com/anatomy/nervou­s/common-peroneal-nerve

    "The common peroneal nerve is one of two major branches of the sciatic nerves within the buttocks and into the thighs, along with the tibial nerves. The many branches of these nerves supply nerve impulses to and from the muscles and skin in the hip joints and thighs, the lower legs, feet and most of the skin below the knee."

  • Good find, thanks. Thinking about it some more, I'm an idiot and forgot that my commuter/winter bike (which I've not ridden for 6 months due to WFH) also has a Fabric Tri saddle and didn't have this issue. Process of elimination suggests the Axis saddle needs to go. Annoyingly I actually find it very comfortable and don't feel any pressure 🤔

  • Try adjusting it first?

  • It’s causing numbness which is why you can’t feel the pressure.

    (Not serious)

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Bike fit / correct riding position

Posted by Avatar for Timmy2wheels @Timmy2wheels

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