Originally Posted by
AnkleWork
There's no way to say this gently: that gear combination is a bad idea and all the advice offered in response just makes it worse. You have a gear selection problem, not a chain tension problem. Your bike has multiple gears just so you can avoid big-big and small-small.
I do realize that I can use other gears but the bike is actually for one of my kids so I can't be assured they won't use those combinations and if they try the large/large cog combo, I think it might damage the rear derailleur.
Maybe I can just adjust the front derailleur so that it is limited to two cogs instead of three? I'll hve to try it out.