My arms are killing me

Zudnik said:
27.5. I'll try letting a little out at a time. I'm a heavy guy so always worry about trashing the rims. Low skills and heavy weight... Thanks
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25 miles is a good run. Other comments are good. I'll add that I read and learned that having your shifters and brake controls adjusted so your wrists are relatively straight in line with your arms helped me too. My controls needed to be rotated up from where I had them....it helped me. keeping your grip loose (as stated) and elbows bent and willing to comply with the terrain (a bit) helps. Also, kinda like how your butt hates the seat at first, with time (combined with the suggestions) you get use to it. Tire pressure opinion varies. I'm 175lbs with gear (or so I tell myself) and I run 16-17 front, 17-18 rear with 27.5 x 2.6 and 7.5 or so with 3.8's on a fat bike (on rocks). I know I could run less but this works for me.
 
Another variable is saddle tilt. Tilting front of saddle up (small increments for obvious reasons) could help....
 
Thanks all. Lowered my rear tire to 18psi today and road a few laps of the orange trail at LMP plus others. Felt a bit better although it felt like the rear may have squished a bit at times. You could hear it moving around over the roots at the top etc. Repositioned my hand controls a bit and that also helped. Actually feels like I need to try to somehow move the seat back .... I find myself sitting on the rear of the seat when coming down more technical sections (well it's technical to me lol). Thanks all.
 
A poorly set-up suspension fork can create hand cramping/fatigue. If you have a fork with an air spring (most) make sure you have the correct air pressure. Most forks have a guide on one of the lower legs that will give you estimated correct air pressure for your weight. If there's no guide on the fork you can just google it for setup.

Rebound damping (how quickly the fork is allowed to extend after it's compressed) is also super important. If rebound damping is excessive (i.e. extending too slowly) then your hands will probably hurt when riding bumpy terrain.

Check this video out for a good way to set up rebound damping from Fox tech Jordi. Fast forward to the 4min mark:

 
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