What is it?
Chain length calculator does nothing more and nothing less than working out what the length of your chain should be, expressed in number of links. You can use cm or inches to input your chainstay length (you should always be able to find this out on your bike manufacturer's website inventory or in the manual it came with), and then add your outer chainring size and number of teeth on your biggest cassette ring and hey presto, it's done.
What makes it unique?
The simplicity more than anything - although there are plenty of similar calculators you can find on websites with a quick Google, but this saves you a bit of typing once you've got the app and it doesn't really take up any space on your phone.
How can it help me?
It works out how long your chain needs to be of course! While you can just go by the "big big and add two links" method, this takes out any estimations whatsoever and makes life that little bit easier if you're not confident of getting it spot on.
Where can I get it?
Unfortunately for iPhone owners this app, which can be downloaded here, is Android-only... but we've found one very similar on the iOS store here.
After cobbling together a few hundred quid during his student days off the back of a hard winter selling hats (long story), Jack bought his first road bike at the age of 20 and has been hooked ever since. He was Staff Writer at 220 Triathlon magazine for two years before joining road.cc in 2017, and reports on all things tech as well as editing the road.cc live blog. He is also the news editor of our electric-powered sister site eBikeTips. Jack's preferred events are time trials, sportives, triathlons and pogo sticking (the latter being another long story), and on Sunday afternoons he can often be found on an M5 service station indulging in his favourite post-race meal of 20 chicken nuggets, a sausage roll, caramel shortbread and a large strawberry milkshake.