Tech Question

Where speeds may exceed 60 kmph

Tech Question

Postby JB » Tue Mar 06, 2012 12:18 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, :)
JB
 
Posts: 251
Joined: Thu May 19, 2011 4:45 am

by BNA » Tue Mar 06, 2012 12:22 pm

BNA
 

Re: Tech Question

Postby bigfriendlyvegan » Tue Mar 06, 2012 12:22 pm

User avatar
bigfriendlyvegan
 
Posts: 2889
Joined: Tue Apr 01, 2008 1:18 pm
Location: Denistone, NSW

Re: Tech Question

Postby JB » Tue Mar 06, 2012 12:53 pm

cool - thanks for that. :)
JB
 
Posts: 251
Joined: Thu May 19, 2011 4:45 am

Re: Tech Question

Postby brentono » Wed Mar 07, 2012 4:40 pm

Think 49x19 is close.
:mrgreen:

A great training gear for men and boys. :)
Lone Rider- I rode on the long, dark road... before I danced under the lights.
User avatar
brentono
 
Posts: 3667
Joined: Mon Jul 13, 2009 12:33 pm
Location: Perth DubyaEh.

Re: Tech Question - Rollout U13

Postby JB » Thu Mar 08, 2012 10:55 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
JB
 
Posts: 251
Joined: Thu May 19, 2011 4:45 am

Re: Tech Question

Postby brentono » Sat Mar 10, 2012 10:54 am

Many Clubs quote 42x16 for their U13 rollout (>5.5) :roll:
:mrgreen:
Lone Rider- I rode on the long, dark road... before I danced under the lights.
User avatar
brentono
 
Posts: 3667
Joined: Mon Jul 13, 2009 12:33 pm
Location: Perth DubyaEh.

Re: Tech Question

Postby JB » Sat Mar 10, 2012 12:07 pm

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


they risk getting caught when roll-outs are checked at race time...not worth it.
JB
 
Posts: 251
Joined: Thu May 19, 2011 4:45 am

Re: Tech Question

Postby brawlo » Sat Mar 10, 2012 6:32 pm

Nothing worse for your little one than to have their moment of glory taken away from them!
brawlo
 
Posts: 365
Joined: Fri Dec 18, 2009 4:01 pm
Location: Goulburn, NSW

Re: Tech Question

Postby brentono » Sun Mar 11, 2012 3:17 pm

Nothing worse than taking the little man out, and not being able to give him a run. :)
:mrgreen:
Lone Rider- I rode on the long, dark road... before I danced under the lights.
User avatar
brentono
 
Posts: 3667
Joined: Mon Jul 13, 2009 12:33 pm
Location: Perth DubyaEh.

Re: Tech Question

Postby bigfriendlyvegan » Mon Mar 12, 2012 10:07 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) :D

I was going to go with - "That's what she said", but think it's a bit overused.
User avatar
bigfriendlyvegan
 
Posts: 2889
Joined: Tue Apr 01, 2008 1:18 pm
Location: Denistone, NSW

Re: Tech Question

Postby scotto » Mon Mar 12, 2012 1:43 pm

Image
User avatar
scotto
 
Posts: 2336
Joined: Tue Dec 01, 2009 8:38 am
Location: Baulkham Hills

Re: Tech Question

Postby bp2 » Sat Mar 31, 2012 12:32 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
bp2
 
Posts: 16
Joined: Tue Mar 08, 2011 11:52 am


Return to Track

Who is online

Users browsing this forum: Derny Driver



Support BNA
Click for online shops
Torpedo 7 Torpedo7 AU
Ground Effect Ground Effect NZ
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
Cycling Express Cycling Express
Ebay Ebay AU
ProBikeKit ProBikeKit UK
Evans Cycles Evans Cycles UK
JensonUSA Jenson USA
JensonUSA Competitive Cyclist