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Old 07-23-19, 08:20 AM
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Arm fatigue after switching to MTB

I've been road biking for years and this year I switched to a mountain bike (GT Aggressor Pro). I've been training on flat road and usually after about 5 miles I'm getting severe arm fatigue in the elbow pit/forearm area. I'm thinking it might have something to do with bike geometry or improper adjustment. I do like to have my seat high like on Road Bike, maybe that's causing it? Is there some kind of adjustment I can make to handlebars, etc.? I'd love to hear any suggestions you guys might have!
I'm 5'11" and bike frame size "L" (it's 2018 GT Aggressor Pro, 27.5" wheels)
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