I am about to make the leap and buy a 6-speed Bromptom M type. I will definitely need to add new grips to add 1 or more hand positions. I'm considering the Ergon's (http://www.ergon-bike.com/us/en/home#) which I've seen mentioned on other posts. My questions are:
1) Is it easy to add a GP4 or a GP5?
2) Do either of these grips affect the fold?
3) Can the bike be packed in the travel case with these grips?
4) Should I be considering other grips?

Thanks!