I have 20kph legs

[MisterStan]

[QUOTE 4596429, member: 259"]Sigh.

• Distance in Miles
• Speed in Kph.

[/QUOTE]
A Chippy I work with does this, 'can you cut me a piece 4 inches by 25 cm please?'

Drives me mad....

 

[screenman]

A Chippy I work with does this, 'can you cut me a piece 4 inches by 25 cm please?'

Drives me mad....

It is an age thing, normally around 60

 

[MisterStan]

*snip* Dealing with whole numbers only *snip* ...

• 1 km ~= 0.5 mile

Mmmmm......

 

[mjr]

The EASIEST way, IMO, is to half the kilometre distance, for example 80 (40).
Divide the 40 by four (10) and add to the half total (40) to quarter total (10) and you get 50.

It's not 100% exact but near enough. And it's simple.

It involves remembering stuff so it's not as simple as dividing by four then dividing by four again and multiplying by ten.

 

[ColinJ]

Mmmmm......

That is near enough for normal purposes. Not anally accurate, but fine for logging our general riding.

Using that method, here are some examples ... [x km ~= y miles (actual figure z to 2 decimal places)]

• 37 km ~= 23 miles (22.99 miles)
• 53 km ~= 33 miles (32.93 miles)
• 89 km ~= 55.5 miles (55.30 miles)
• 100 km ~= 62.5 miles (62.14 miles)
• 160 km ~= 100 miles (99.42 miles)
• 200 km ~= 125 miles (124.27 miles)

I'm happy with that kind of error.

 

[Joey Shabadoo]

If you catch a sparrow at the start of your ride, stick it in your pocket and at the end of the ride cut it's right leg off. The number of hops it takes before it gets off the ground is your average speed in km/h,

For mph you need a starling.

 

[Fnaar]

Miss Goodbody has "Wednesday Legs".

 

[Dayvo]

It involves remembering stuff so it's not as simple as dividing by four then dividing by four again and multiplying by ten.

Depends if you're hot, cold, tired, wet, hungry, thirsty, injured, lost etc.

Mental arithmetic, however simple, needs the brain to be sharp and focused.

 

[Oxo]

If you catch a sparrow at the start of your ride, stick it in your pocket and at the end of the ride cut it's right leg off. The number of hops it takes before it gets off the ground is your average speed in km/h,

For mph you need a starling.

I think that only applies in a velodrome, going round the track.

 

[nickyboy]

This could be the "Things you do to take your mind off your suffering whilst cycling up a big hill" thread....

My garmin is set on Imperial so I start converting stuff to Metric...distance travelled, speed, average speed....multiplying everything by 1.6. Converting the climbing feet to climbing metres (multiply by 3, divide by 10)

If I can do it I know I'm not climbing hard enough

 

[Tin Pot]

If you can't multiply by 0.62 in your head you shouldn't be allowed a bicycle!

 

[Tin Pot]

I have never been a racer and I am not trying to increase my speed. But I thought I would try and "Push" it on the way home on my 20km commute tonight.

I can ride all day with little effort at 20kph.

Well I pushed it up and down hill and in the end achieved an average of 21.4kph and had a tongue like a lolling dog and was knackered. The extra effort was not worth the extra distance. Tortoise and hare springs to mind.

Has anyone else found this with their riding?

The results are exactly as you should expect.

You currently have a max output and an "all-day"/aerobic output. When you commute* your body settles into the sustainable aerobic output that doesn't tax it too much - you're not racing for your life**.

To increase your output at easy aerobic levels you need to work harder or longer, so keep doing the 21.4kph average rides and soon your body will adapt and find it an easy cruise.

*Commutes are limited speed endeavours regardless of your effort
**We hope