>>998794>Indexed only is the major reason.>On paper, grip shifters were developed because SRAM wanted a way to shift without taking your hand off the bars. IMO this is a case of inventing a solution for a problem that doesn't exist.>I suspect the -real- reason is because they wanted grip shifters to mimic motorcycle throttles. Yuck.Actually, the truth is even more horrifying: Grip Shift was originally designed for triathletes, they were the only shifters that could fit on the funky aerobars that were popular in the late 80's.
>>998783The main issue folks have with twist shifters is that it's easy to accidentally grab the shifter while riding over something rough, throwing your bike into a different gear at inopportune moments.
>>998795It's tough to say anything for sure since used values have a lot of random variation, but I'd say, at least with mountain bikes, once you get above $3,000 bikes your odds of being happier with what you get buying new increase, because formerly high dollar bikes on the used market are often there because they've been thrashed and/or because there's already a superior model on the market.
