Looking for rings to increase ratio on kids bike

[David Hill]

I'm looking to try to increase the gear ratio on my son's roadie. It's a 24" wheel, with a 42 front ring and 13 rear.
He spins out on downhills and is frustrated as all get out. He's 12 years old.

Wonder if anyone has a line on some different rings - thinking a 50 front and 12 or 11 rear will get him up towards a 7.5 m gain ratio, which I think is within the allowable limits for racing?

I was told Steve Lund might be the guy to talk with, but I don't have your direct email, if you're listening...

Thanks,

[Lister Farrar]

Hi Dave
If you go with a bigger chainring you will probably need a longer chain, and maybe a bigger inner ring to stay within the range of the front derailleur. You said earlier he had a 14 small cog so the commonly available 12 will give you a big jump. If its 13, an 11 would also. How many cogs? 8, 9 or 10?

I have some chain rings, but I'd try a different cassette first. Can he come early for the track ride today?