Just got my first 11 speed bike (105) - need a chain tool just in case - any recommendations? I might go 11 speed Campag on another bike, does this need a separate tool ("peening"???)
On the Campag and Shimano or KMC ones, just use KMC 11-speed missing link and to break the chain you can just use a 10 speed chain tool if you already have one. This is the easiest way.
I can recommend the Lezyne Chain Drive 11-speed chain tool. This works well at breaking an 11-speed chain and also at peening Campag joining pins. As mfin says, the easiest way is to use a KMC missing link, but having the Lezyne tool also gives you the option of using the Campag approved way of joining.
Although I found it's possible with care to break an 11-speed chain with an old nine-speed tool, a proper 11-speed tool is much better. The pins in 11-speed chain are in very tight and the side plates are very narrow. An 11-speed tool supports the back of the plates which prevents the risk of them being distorted when you press out the pins.
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Just use a KMC chain on Campagnolo for less hassle and expense.
If you do go with a Campag chain. You will def need a rivet peening tool. Otherwise the connecting rivet will fail if not peened.
Although I found it's possible with care to break an 11-speed chain with an old nine-speed tool, a proper 11-speed tool is much better. The pins in 11-speed chain are in very tight and the side plates are very narrow. An 11-speed tool supports the back of the plates which prevents the risk of them being distorted when you press out the pins.
http://www.wiggle.co.uk/lezyne-rap-14-multitool-y8/
Chain tool works great but then I find most Lezyne stuff is good quality.