Ranger63

Can it be done?
Seems to me,indexed is indexed be it twist grip or downtube
Looking to maintain touring style drop bars.
Going with a rim brake front and the coaster braked Shimano Nexus 7 hub rear (700C wheels)
No idea what went in the header ..I thought i typed in SHIFTER ...obviously not /

rhenning

Derailleur and internal gear hubs I believe are not spaced the same. Roger

Scooby214

I think the cable pull may be different. If you want to try a bar end shifter, there is a Jtek shifter for the Nexus 7. If you don't have the hub yet, you can get a downtube shifter for Sturmey Archer 3 speed and 5 speed hubs. I have a Sturmey 3 speed bar end shifter on my Nitto Noodle drop bars, and it works nicely.

Airburst

The cable pull will almost certainly be different (heck, there are 5 standards of cable pull* I can name off the top of my head just for bloody rear derailleurs, without even throwing hub gears into the mix), and you can't really friction-shift an IGH with more than 3 gears (and even then it's a dicey prospect). If the Jtek bar-end shifter is one of the ones that's basically a downtube shifter boss with an expander to fit it to the end of the bar, and a separate shift lever bolted on, there's nothing to stop you taking the actual lever off one and putting it on your downtube shifter boss. However, I don't know if the Jtek is made that way.

Don't run an IGH with the wrong indexing, because unlike a derailleur, which will just run roughly or jump around, IGH systems can very easily be damaged by being ridden when not correctly adjusted.

*Shimano MTB, new Shimano road, Campagnolo, Suntour and SRAM 2:1

FBinNY 

No index isn't index.

The lever doesn't magically communicate what gear number you select. It moves the cable a fixed distance. That in turns moves the RD or hub's clutch a corresponding distance. The system only works id that movement matches what is necessary to move to the next gear, and that varies with the brand, type and number of gears.

If you want to use D/T levers, you'd be better off with friction levers, and learn the positions by eye (not easy with 7s, but may be workable with 3s or 5s). Or you might try some combination of index lever and a "travel agent" or similar cable travel adapter to match the index spacing to the hub's spacing.

dsbrantjr

"Looking to maintain touring style drop bars."
J-Tek shifter on your bar end: https://jtekengineering.com/barendshifter.php
Doubt that it can be disassembled and DT mounted but maybe J-Tek will tell you.

Ranger63

FBinNY..Best (although all were good)response. One of those "The light bulb came on and the Ahhhh follows" responses that clarified the situation.
Much as I'm not a true fan of twist grip anything the oem setup looks like the route to follow if one wants precise shifting from the get go.
I'm planing on the sh. nexus 7 with the coaster brake (not the roller/drum)
Basic research showed the nexus 7 to have the most evenly spaced setup (Rolhoff not included)and for the flat/rolling countryside riding the bike will see, that is what I want.
I'll have to look at the bars that will work with the twist grip and see what's going to work best for me
Thanks again.

Dan Burkhart 

Have you considered a Sturmey Archer 5 speed wide range? It has a 256% range compared to 245% for the 7 speed Nexus. Available shifters include downtube, bar end, twist, thumb, or rapid fire style 2 paddle.

mconlonx

Don't be scared off, just that it's not a problem with an off the shelf solution. Contact JTek -- they might have some solution none of us have thought of. Also, they do a Nexus 7sp bar end shifter if you want to keep your drop bars. Their shifters clamp around the outside of the bar, they do not insert into the end like traditional bar end shifters.

Scooby214

+1 on the Jtek bar end shifter. They get great reviews, with many finding them superior in shifting to the nexus 7 Revo twist shifter.

dsbrantjr

You can use the twist shifters on drop bars with the use of a HubBub adapter; here's one source: https://www.jensonusa.com/Hubbub-Twis...op-Bar-Adapter

The J-Tek bar-end shifter would be my choice, if you have a supported hub. It's cheaper than the HubBub plus the grip shifter and cleaner looking.