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Bicycle Obsession

Goin' Crazy in 2009

  • Offroad Riding - 13002.72 miles [289]
  • Aborted Riding - 61.00 miles [3]
  • Turbo Trainer - 33.70 miles [3]
  • (TOC) 13063.72 miles
  • (TA) 13097.42 miles

Hurtin' in 2008

  • Offroad Riding - 10602.84 miles [300]
  • Turbo Trainer - 130.20 miles [8]
  • Running - 114.56 miles [24]
  • Aborted Riding - 37.20 miles [2]
  • (TOC) 10640.04 miles
  • (TR) 114.56 miles
  • (TA) 10884.8 miles

Riding in 2007

  • Offroad Riding - 8365.93 miles [300]
  • Road Riding - 3599.80 miles [70]
  • Turbo Trainer - 50.90 miles [3]
  • (TOC) 11965.73 miles
  • (TA) 12016.63 miles

This Week

Riding in 2006

Riding in 2005

Riding in 2004

My Bikes:

Current Gems

  • 2004 Pink Surly 1x1
  • 2000 Kona Kaboom
  • 2006 Santa Cruz Chameleon

Singlespeeds

29er

Geared

Road

Ladies in Waiting


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Mattmagic.com

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Shake Rattle and Roll

23 Feb 2008 at 17:41 Filed Under:

38.9 miles - 12.9 avg

In very windy conditions, so not a bad effort, and explains why I was hurting so much towards the end (hurting so much I didn't want to breathe).

I don't even realise I'm riding all that fast, I have to assume that for my natural RPM the 29er moves faster than my 26er. I have never really bothered to find out, I assumed it was geared so one revolution would move the bike a comparable distance, but thinking about it, it's more likely that the FORCE required to move one revolution is the same, but the distance is more, or something... I feel an experiment coming on....

/ disappears for a while

Result!

The WD40 can indicates the start of the bike.

29er test

The GT85 can is the where the 29er ends after one crank turn, the Screwfix chain lube can (blue) is where the 26er ends.

29er test

So I guess the bikes are pretty evenly matched.

The People Comment: (19 responses)

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richhttp://www.lifeinthebuslane.com

21:31 23 Feb

That's not what I expected.

From your whinges, I'd assumed the 29er would have been geared slightly higher.

matthttp://mattmagic.com

21:34 23 Feb

I didn't think it was quite that close, but on reflection it doesn't feel harder on tarmac or non sticky paths, it just has a lot more rubber in contact with the ground so it grips the sticky / sloppy stuff more and drags.

And they're comments not whinges.

Simonhttp://www.simonbarnes.net

21:45 23 Feb

I think it's ace that you've used cans of lube/solvent to determine this rather than a calculator :)

matthttp://mattmagic.com

21:46 23 Feb

Well, I didn't know the exact dimensions of the tyres.

Raoulhttp://www.raouligan.co.uk

22:01 23 Feb

C=3.1742 x D........

Bigger wheels have reduced rolling resistance but are slower to accelerate and weigh more.

There was a big thing about at one point on the road/triathlon scene about people using smaller wheels on TT bikes because they were more aero, which they were but this was cancelled out by rolling resistance....

matthttp://mattmagic.com

22:08 23 Feb

Yes, Raoul I know Maths!

although you seem to have mad up the value for Pi.

Anyway, I don't know the ⋄ of the *tyre*

Raoulhttp://www.raouligan.co.uk

22:17 23 Feb

Ah yes ooops, tape measure, although your way is just as accurate.... ;0)

matthttp://mattmagic.com

22:36 23 Feb

Maths tells me it's 17cm if they're no tyres on the bikes

Raoulhttp://www.raouligan.co.uk

22:44 23 Feb

http://www.vassagocycles.com/calc.html

samurihttp://www.samuri.co.uk

00:16 24 Feb

your neighbours must think you're great and not at all insane.

samurihttp://www.samuri.co.uk

00:18 24 Feb

and I've just noticed, you've almost ridden twice what I have this year already, and I've ridden a long way.

granthttp://www.septimus.org

00:27 24 Feb

He's ridden 2.5 times what I've done.

Thing is, I was ill in Jan, so in those 2 weeks at the start of the year I'd have gotten another 700 miles in. Honest. :-D

Phil Smith

18:12 24 Feb

I don't suppose it occured to you that one full turn on the 26er turns the wheel 26 inches and one full turn takes the 29er - er 29 inches. making every full turn on the 29er a full 3 inches further? Those can certainly look 3 inches apart.

Brant Richardshttp://www.on-one.co.uk

19:15 24 Feb

I'm not coming round for a Pi at your house Phil.

Matthttp://mattmagic.com

19:15 24 Feb

Erm........ HU?

Matthttp://mattmagic.com

19:17 24 Feb

I really thought I'd become a massive retard reading that comment.

I'd not like to ride a bike that only moved just over 2ft per crank revolution!

samurihttp://www.samuri.co.uk

23:16 24 Feb

you could ride a BMX in 21:16, that'd take you 26 inches. ;-) It'd be quite easy to pedal though. ;-)

MikeD

11:29 26 Feb

Gotta love smartarsed but wholly wrong responses :-)

matthttp://mattmagic.com

14:23 26 Feb

Indeed, but he's Raoul so we'll let him off ;)

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