Originally Posted by
brianogilvie
An entry level Trek mountain bike with a 48-38-28 crankset and a 14-34 7-speed cassette has a gear range of 416% (i.e., in the highest gear, in one pedal stroke you go 4.16 times as far as you would in the lowest gear). The only IGHs I know that approach or exceed that range are the Shimano Alfine 11-speed and the 14-speed Rohloff, which are both expensive. You could use an 8-speed hub and get a decent range, though. I have an 8-speed on my commuter bike.
If you use a chain tensionner or a rear derailleur, you can use a front derailleur and a double/triple with an IGH. Not for everybody, but can be useful in many situations.