Originally Posted by
fietsbob
they have used the 105 model name for decades, and changed the product, so that's inadequate , to be accurate,
you need to read the other numbers off the back of the arms..
I have an old set of square taper Dura Ace cranks , I put on my Bike Friday, they're ' FC 7410 '... for example.
yea LBS is a good idea, no need to buy tools you use once to take the old off, then nreed something else to put the new on..
....
There's a link in the OP to the group set that is presumably being used... a Shimano 105 5800 11 speed.