ratrod

I know when you run a double you wrap the chain around the biggest cog and chain ring then add 2 links. Is it the same when you are running just one chain ring ?
Thanks

BCRider

Yes

limeylew

With all due respect here, if you only have 1 chainring, it WILL be the biggest one.

Therefore I'd say the answer would be YES.

Retro Grouch 

Now I'm wondering why you're asking.

If you happen to be running a rear hub with only one cog, you definitely do not want to add the extra inch of chain.

ratrod

1 chain ring in front, 10 speed cassette in the back. On a double you don't use the outside chain ring while using the inside (biggest) cog. With a single chain ring, I will now be using the biggest chain ring (the only one) and the biggest cog. Thus the question, do I need to use a longer chain or is plus two links fine?

JiveTurkey

If by "two links" you mean one inner link and 1 outer link (1" total=1 full link=1 link), then yeah you'll be fine. You could get away with the chain being a bit longer though because there's a lot less potential slack for the rear derailleur to pick up between the big/big and small/small combos, but there's no need for it. Edit: While big/big is generally discouraged, the method described allows the physical ability to run big/big (without something immediately really bad happening). If you're using a standard crank and bottom bracket with just the outer ring, be aware you're still going to be cross-chaining while in the largest cog (1st gear).