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I've got PRO Koryak (sp?) bars that maybe put my wrists in a weird position but I've not ridden it enough to work it out. I moved the brakes closer to the grips but I'm still 1-finger braking so I have plenty two bigger fingers on the bars. I wonder if the little fingers were just rattling off the ends of the bars? I had this during Paris Brest on the road bike and the trick was to hold the loose fingers together so they didn't "rattle". Bit hard to explain.
Another note I took was that the shifters bump my fingers so I think I want to shift them further away independently of the brake levers. The SID grips are very thin and hard and I have big hands - that's why I was thinking fatter, softer grips might help back off the grip and offer some padding too.
Yeah, having not seat under me feels odd. I guess also there's a bunch of muscles being used that a normally doing nothing because I'm sat down for all descents. It's knackering!
I also have Shimano flat shoes so I'll give those a go next time. IIRC they have a slightly stiffer sole. I need to put my Catalyst midfoot pedals on - they're not wide but they have a very long platform which helps stop the shoe bending over the front/back. I don't have them handy at the moment but something like the Crank Bros pedals could be an option.
Because I'm riding midfoot, the FiveTens are only 85mm wide at that part of the shoe and allowing for my UK12 to clear the cranks I'm probably hanging my shoes off the side of the Nukeproofs (they're 100mm wide in the middle)
Crank Bros: 114mm x 111m (Large) would give an extra 11mm at least which could help.
I used to get unbearable finger pain on long descents (at the joints), a combo between death gripping and thin grips. I now use ODI Rogues which are pretty fat and I'm more confident so less death grippage. Also, one finger breaking so good hold on the bars. Do you have a particularly weird bar shape?
Dropper posts obviously help with the danger of getting booted up the arse and over the bars on steep to moderate descents but also with the left, right movement which is part of good cornering technique. Letting the bike lean underneath you into the corner etc basically having all that space between your legs is letting the bike move about like a mad thing while you're solid and also loose on top. So, I'd say just getting used to it is right.
My feet can ache first time on the MTB in a while, as we know road shoes are stiff as and flat five tens are not. I use Shimano AM9 with XTR spds on gravel bike so kinda in-between but a lot stiffer than FiveTens with no issue.
I ride FiveTen Freerider and Crank Bros Stamp 7's in the large variation and they are big (im only UK10). Ultimately though, foot ache isn't an issue, cant remember it really bothering me recently. Less foot wrap on the pedal, I assumed, helps with foot pain. That was my thoughts in getting big pedals and seems to have worked.