Interchanging Ultegra & 105
quarkrad809 Posts: 23
Age has now forced me to considering moving to a 32T rear cassette I have a Ultegra di2 6870 11sp rear derailleur and will need a new cassette and change the cage. Is it OK to put on a new 105 11sp cassette rather than the ultegra? The other confusing thing is I see lots of adverts for the GS inner cage plate that I will need to buy (my existing derailleur is a short cage) but never an advert for an outer cage. This doesn't make sense to me - surely the majority of purchases will be for both!
On mechanical rear Shimano mechs the difference between a "Short cage " and "GS" is not simply the cage. The body of the mechs are different.
Fitting a longer cage to your mech. will increase chain wrap i.e. the amount of slack chain it will take up but will make no difference to the size of the biggest sprocket you can use.