Cycle formula

Cycle-touring, Expeditions, Adventures, Major cycle routes NOT LeJoG (see other special board)
wendy rose
Posts: 7
Joined: 31 Aug 2018, 3:55pm

Cycle formula

Postby wendy rose » 30 Sep 2018, 12:06pm

Can anyone suggest a touring cycle formula for extra journey time for height climbed please? Something akin to the climbers' Naismith's rule perhaps.

User avatar
meic
Posts: 19355
Joined: 1 Feb 2007, 9:37pm
Location: Caerfyrddin (Carmarthen)

Re: Cycle formula

Postby meic » 30 Sep 2018, 2:22pm

Using the same Naismith rule is pretty adequate.
It obviously should be different in that we go down hills fast and effortlessly on a cycle compared to walking, however it doesnt seem to prevent it working. I assume it works because the allowances given for height will be take into account this fact, as they are arrived at empirically rather than theoretically.

As an example 10mph plus 1 hour for every 400m climbed (ignore descent figures) would work pretty well for quite a few touring cyclists.
Obviously the figures need adjusting for each individual and their condition.

Wind is a big factor but generally not bothered with systematically, you could use some rough and ready reckoning by adding or subtracting from the cruising speed. On the whole more hills that you have, the less impact the wind has.

I did use Naismith for predicting my journey times when using purchased mapping on the PC and at the time, after finding my personal "speeds", it was impressively accurate. Since mapping went on-line I stopped using it.
Yma o Hyd

wendy rose
Posts: 7
Joined: 31 Aug 2018, 3:55pm

Re: Cycle formula

Postby wendy rose » 30 Sep 2018, 3:35pm

Thank you very much meic. Good to read. I will try it .WR.