RUBY THE ROOKIE U/15 JUNIOR
Posted: 30 Aug 2012, 11:37
Hi to everyone at DHBC. We have been out to the velodrome 3x now and Ruby is inspired to begin track cycling with DHBC.
Big thanks to Lizanne last night for answering our questions and warmly welcoming us to the fold.
Ruby has joined DHBC/Cycling NSW this morning, a precious email silver licence to suffice until her membership card arrives in the snailmail.
Whilst she will avail herself of a club "loanbike" for her first couple of tries, Dad (Alan) has been thoroughly researching the marketplace for a suitable track bike of her own.
One big question though..... The gearollout of 6m for U/15 is a complicated calculation. I've poured over the Cycling Australia gearchart. Plugging in the wheel+tyre diameter to the spreadsheet varies the chainring/cog combos, expensive proposition if you buy the wrong size chainring.
What is the precise diameter of a 700c wheel running a 23mm width tyre?
Plug 700mm into the gearchart gives one set of gear options under 6.0, plug 690mm and it gives another.
Can anyone suggest the best chainring/cog options. Im a dinosaur, always measured gears in inches, my reckoning is to provide her bike with the capabilities to ride 66/72/76. Is 76 equivalent to a 6m rollout ?
regards
Alan + Ruby
Big thanks to Lizanne last night for answering our questions and warmly welcoming us to the fold.
Ruby has joined DHBC/Cycling NSW this morning, a precious email silver licence to suffice until her membership card arrives in the snailmail.
Whilst she will avail herself of a club "loanbike" for her first couple of tries, Dad (Alan) has been thoroughly researching the marketplace for a suitable track bike of her own.
One big question though..... The gearollout of 6m for U/15 is a complicated calculation. I've poured over the Cycling Australia gearchart. Plugging in the wheel+tyre diameter to the spreadsheet varies the chainring/cog combos, expensive proposition if you buy the wrong size chainring.
What is the precise diameter of a 700c wheel running a 23mm width tyre?
Plug 700mm into the gearchart gives one set of gear options under 6.0, plug 690mm and it gives another.
Can anyone suggest the best chainring/cog options. Im a dinosaur, always measured gears in inches, my reckoning is to provide her bike with the capabilities to ride 66/72/76. Is 76 equivalent to a 6m rollout ?
regards
Alan + Ruby