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Cos you may as well run gears? Have the right gear for all eventualities without having to piss about with undoing wheels.
For me singlespeeding is about always being in the wrong gear and not worrying about it because there is nothing you can do about it with no other options. Spin to win on the road sections.
I've put gears on my bike recently as I've been riding with grade-A hitters and don't want to hold them up even more!
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Ha...seriously? one gear to ride to the trails without changing...one gear for on the trails without changing. it's still singlespeed for both types of riding. You don't keep swapping each time you get to the top and bottom of a hill. :)
Why add full gears/mechs/shifters and lose all the benefits of singlespeed when adding a dingle retains all the benefits of it but also gives you the benefits of a higher gear too for the road?
You will lose far more time spinning like a twat for an hour on an off road gear getting to the trails than you lose just loosening the wheel and moving the chain across once on arrival and once before heading home.
I honestly think this is why so many people try, and then give up on singlespeed...because they can't be arsed to spin like crazy on the road to get to the trails, and aren't lucky enough to have trails on their doorstep.
I'm surprised more people don't run dinglespeed for the very reason that it's a pain in the arse to ride your 'off road' gear 'on road' to the trails. If it takes a significant amount of time to get there and then you'll be spending a worthwhile amount of time off road, it's definitely worth the minute it takes to undo the wheel and move the chain across.