Customized Gravity Mountain Bike

Customized Gravity HD Trail Bicycle. 21″ aluminum alloy frame. Front suspension. Shimano Tourney Front and Rear Derailleurs, Tektro Hydraulic brakes front and rear. 29×2.25 wheels and tires. I bought this bike new and installed tread liners and heavy-duty puncture resistant tubes, new grips, new handlebars and a new comfort saddle. I had the bike professionally tuned. Unfortunately, I was only able to ride it once before a health issue rendered it unusable for me. Has been stored inside since then. I have about $1000 invested in the bike in total. Asking $500 obo. I would consider trades of similar value.