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PostPosted: Sun Dec 14, 2008 5:12 pm 
Old School Hero

Joined: Thu Nov 27, 2008 10:03 pm
Posts: 196
I usually do a short hilly ride of 5.81 miles every Sunday for strength and fitness check
Last Week
Distance 5.81 miles (constant)
time 27mins
average speed 12.7 mph
max speed 33mph

This week I changed from a 12-25t to a 12-28t cassette and wanted to asses the difference in average speed . However because the roads were so wet and slippy I only managed 29 mph max so my average is useless.

Can you calculate what my average speed would have been if my max speed hit 33mph today ?

This Week

Distance 5.81 miles (constant)
time 28.4mins
average speed 12.1mph
max speed 29mph :lol:


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PostPosted: Sun Dec 14, 2008 5:16 pm 
retrobike rider / Gold Trader
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No, because your average speed is a function of distance and time.

What would have happened if you hit your max speed for 1/10th second?


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PostPosted: Sun Dec 14, 2008 5:27 pm 
Old School Hero

Joined: Thu Nov 27, 2008 10:03 pm
Posts: 196
see your point but the route is exactly the same its a very short timescale and I get almost exactly the same figures every week for the past 7 weeks Its really uncanny how you can cycle for 30 mins and still get exactly the same average speed to within 0.1 of a second
Also its not just a matter of distance and time is it because you have a variable acceleration
here are my past 4 weeks
average 12.7 12.7 12.7 12.7
time 27.21 27.21 27 27.24
dist 5.81 5.81 5.81 5.81
max 33 33 29 31


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PostPosted: Sun Dec 14, 2008 9:31 pm 
Retrobike's #1 Comedy Genius
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Answer-A: Sir Frank Whittle


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PostPosted: Sun Dec 14, 2008 11:32 pm 
retrobike rider / Gold Trader
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Ok, I'm lost now!

If you route took you 1 hour, and was 10 miles long, your average speed would be 10mph irrespective of whether your top speed was 10mph or 100mph.

Or is my simple heading missing something ....


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PostPosted: Sun Dec 14, 2008 11:46 pm 
Old School Hero

Joined: Thu Nov 27, 2008 10:03 pm
Posts: 196
Kestonian wrote:
Ok, I'm lost now!

If you route took you 1 hour, and was 10 miles long, your average speed would be 10mph irrespective of whether your top speed was 10mph or 100mph.

Or is my simple heading missing something ....


no its me I am just not thinking clearly. :roll:


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PostPosted: Mon Dec 15, 2008 12:41 am 
retrobike rider / Gold Trader
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Phew. Now what's Frank Whittle got to do with anything?

:D


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PostPosted: Mon Dec 15, 2008 10:37 am 
retrobike rider
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Only thing you may want to work out is what you average speed would be if your cadence had stayed the same as before.


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PostPosted: Mon Dec 15, 2008 8:51 pm 
Retrobike's #1 Comedy Genius
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Kestonian wrote:
Phew. Now what's Frank Whittle got to do with anything?

:D


If you answer any question with the answer 'Sir Frank Whittle', you will be correct 2.3% of the time.

FACT*



*ish


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PostPosted: Mon Dec 15, 2008 8:56 pm 
Old School Grand Master
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Joined: Sat May 20, 2006 2:56 pm
Posts: 4776
Location: No brakes? Way to commit soldier.
peanut wrote:
I get almost exactly the same figures every week for the past 7 weeks Its really uncanny how you can cycle for 30 mins and still get exactly the same average speed to within 0.1 of a second


Which would suggest, if you're using it as a measure of strength and fitness, that in 7 weeks you've not got any stronger or fitter.

I'd be worrying less about the numbers and more about shaking up your training regime :D


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