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I have a bit of a Frankenstein bike made from odd parts and it has straight handlebars with twist grip gears fitted to an old road bike style frame. I hate the straight bars but love the twist grip - is it possible to retain the twist grip but change the bars to drop down?

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    You can fit twist shifters on any bar that has a straight end of the required length and diameter. Some twisters are too long for drops, and I don't know about the diameter, but you could probably make something fit. However, when you ride "on the drops" your hands tend to put a fair amount of torque on the bar ends, and so you'd tend to twist the shifters when you didn't mean to. Plus, the constant weight on the shifters would likely cause them to fail prematurely. – Daniel R Hicks Feb 16 '16 at 14:38
  • @DanielRHicks some twist shifters have quite a small twistable section, which could maybe be positioned well (certainly to avoid the risk of damage from leaning on them long term). But that might negate the (questionable) benefits of fitting them in the first place. – Chris H Feb 16 '16 at 15:14
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Most drop bars have a different diameter than flat bars, and therefore cannot fit a twist grip (which is designed for flat bars).

Moreover, you have to get the twist grip to an appropriate position on the bar so you can shift easily. Some BSO's have drop bars with twist grips, but these allegedly have been sawed in half to get the twist shifters on from the center and are being held together by the stem. This is not a good idea.

The easiest way to get twist shifters on a drop bar is a HubBub drop bar adapter, which plugs in as a bar end for the twist shifter to be attached to. Though, it will likely be easier and better to just switch to bar end shifters or some other type of shifter (stem shifters, downtube shifters, brifters, etc.) As DRH said in the comments, you may end up shifting accidentally when using the drops.

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