Tech Question

JB · Postby JB » Tue Mar 06, 2012 1:18 pm

Hi,
what combination of rear cog and chain ring does the best for a 5.5 metre rollout (U13)? (I need to place an order for sons Track bike).

cheers,

bigfriendlyvegan · Postby **bigfriendlyvegan** » Tue Mar 06, 2012 1:22 pm

JB · Postby JB » Tue Mar 06, 2012 1:53 pm

cool - thanks for that.

brentono · Postby **brentono** » Wed Mar 07, 2012 5:40 pm

Think 49x19 is close.

A great training gear for men and boys.

JB · Postby JB » Thu Mar 08, 2012 11:55 am

Since learnt that for a 5.5 roll-out Cycling Australia specifies sprocket 18 and Chain Ring 45

http://www.cycling.org.au/?Page=9497

Cheers

brentono · Postby **brentono** » Sat Mar 10, 2012 11:54 am

Many Clubs quote 42x16 for their U13 rollout (>5.5)

JB · Postby JB » Sat Mar 10, 2012 1:07 pm

brentono wrote:Many Clubs quote 42x16 for their U13 rollout (>5.5)

they risk getting caught when roll-outs are checked at race time...not worth it.

brawlo · Postby **brawlo** » Sat Mar 10, 2012 7:32 pm

Nothing worse for your little one than to have their moment of glory taken away from them!

brentono · Postby **brentono** » Sun Mar 11, 2012 4:17 pm

Nothing worse than taking the little man out, and not being able to give him a run.

bigfriendlyvegan · Postby **bigfriendlyvegan** » Mon Mar 12, 2012 11:07 am

brentono wrote:Nothing worse than taking the little man out, and not being able to give him a run.

And it's even worse when your son can't race (boom, tish)

I was going to go with - "That's what she said", but think it's a bit overused.

scotto · Postby **scotto** » Mon Mar 12, 2012 2:43 pm

bp2 · Postby **bp2** » Sat Mar 31, 2012 1:32 am

with 700c x 23 rear wheel,
or height of wheel at 674mm
49 x 19 = 5.46m
45 x 18 = 5.29m
42 x 16 = 5.55m
44 x 17 = 5.48m