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Changed cranks now numb hands

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Changed cranks now numb hands

Old 08-31-16, 05:01 PM
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Changed cranks now numb hands

Recently changed my cranks from 175 to 170 to help my bad knees with reduced range of motion. I also raised my seat 5mm. My hands are now getting numb much sooner than they used to ( I have carpal tunnel). I assume it is because of the seat height increase but was just wondering if I should have moved my saddle back 5mm to keep my knee to pedal relationship?
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Old 08-31-16, 06:14 PM
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Respectfully I submit that I doubt that a 5mm change in crank length or seat height is responsible for your newer hand issues. Just look at 5mm on a tape measure and tell me that that could possibly be an issue. But... you could always go back to the longer crank. BTW the beneficial effects of crank length reduction are more sought after by recumbent cyclists though I have heard that upright riders can benefit. But 5mm isn't even close to being of benefit. 155mm cranks are common on American recumbents (for some reason Europeans stick with 170/5mm) right down to 130mm. Almost everyone agrees that shorter than 130mm is below the point of diminishing returns. FWIW.

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Old 08-31-16, 06:52 PM
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Sure, try moving the saddle back. Move it back until you can briefly take your hands off the bars, without changing from the normal road position, and without sliding forward on the saddle.

For bad knees, high cadence seems more important, but shorter cranks may help you increase your cadence. Work on increasing cadence until you find you are usually climbing at above 90, assuming slopes where you have the gears to do that. Or changing gearing to allow you to do that.
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Old 09-08-16, 06:13 PM
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Since you raised the saddle 5mm, you must also raise the bar 5mm to keep the relationship the same. And yes, since you raise the seat, it did move slightly rearward (probably under 1mm), but that would end up putting more pressure on the butt rather than the hands. Your problem seems to be that now your bar is 5mm lower than your saddle than before.

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