How big of an effect does wheel diameter have on bicycle performance?

best spinning bike uk image

John P

Answer
Surprisingly not as much as a lot of people would have you believe.Both have their advantages and disadvantages.

The big advantages are; A smaller wheel can be made much lighter and therefore will accelerate quicker. A smaller wheel will be much more resilient to sideways forces.

The disadvantages are that they need to be geared much higher and spin faster (higher frictional losses) for any given speed.

There are few really low rolling resistance tyres available for small wheels. The best that I 'm aware of is Greenspeed's Scorcher here is a review
http://www.bentrideronline.com/reviews/scorchers/scorchers.htm

My conclusion is that on a shorter or winding courses the smaller wheels will be much better. As the riding surface becomes rougher, or softer the advantage shifts towards larger wheels. For sustained higher speeds (ie road cycling) the larger wheels win, but not by a huge margin.

Here is an article that covers the subject well. (and a reliable institution.)
http://hea-www.harvard.edu/~fine/opinions/wheelsize.html

I'll throw in this review of a small wheeled road bike for good measure
http://www.alexmoulton.co.uk/reviews/cycling_plus_bs.html

Does anyone know who Bronson Webb is supposed to be in Harry Potter?

alex

In the movie Harry Potter and the Prisoner of Azkaban, Bronson Webb plays a Slytherin, one of Draco Malfoy's "friends". I was wondering, who is he supposed to be? At first I thought he might be Theodore Nott, but I'm not sure. Does anyone know?

Answer
he is an un-named character:
heres his bio.:
Bronson Webb



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Date of Birth:20 February 1983, London, England, UK more

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Filmography

Dead Man Running (2009) (post-production) .... Smudger


Father (2009) .... Estate Kid
Tenner (2008) .... Homer
Clubbed (2008) .... Scroat
"No Heroics" .... Jackrabbit (1 episode, 2008)
- Mean Gills (2008) TV episode .... Jackrabbit
RocknRolla (2008) .... Paul
The Disappeared (2008/I) .... Gang Leader
Cass (2008) .... The Assassin
The Dark Knight (2008) .... Bounty Hunter #1
... aka Batman: The Dark Knight (USA: informal title)
... aka The Dark Knight: The IMAX Experience (USA: IMAX version)
Eden Lake (2008) .... Reece
The Bank Job (2008) .... Chicken Inn Waiter
Gunrush (2008) (TV) .... Puffa
Much Ado About a Minor Ting (2007) .... Tom
"Murphy's Law" .... Liam Driscoll (3 episodes, 2007)
- Episode #5.3 (2007) TV episode .... Liam Driscoll
- Episode #5.2 (2007) TV episode .... Liam Driscoll
- Episode #5.1 (2007) TV episode .... Liam Driscoll
Atonement (2007) .... Beach Soldier
... aka Reviens-moi (France)
Sugarhouse (2007) .... Gobby Youth
Rabbit Fever (2006) .... Fascist
Venus (2006/I) .... Jessieâs Boyfriend
Mash Up (2006) .... Robert
The Lives of the Saints (2006) .... Emilio
"Eleventh Hour" .... Roly (1 episode, 2006)
- Resurrection (2006) TV episode .... Roly
Chromophobia (2005) .... Hendrix
Kingdom of Heaven (2005) .... Apprentice
... aka Königreich der Himmel (Germany)
... aka Reino de los cielos, El (Spain)
Fingersmith (2005) (TV) .... John Vroom
The Commander: Blackdog (2005) (TV) .... Liam Cripps
"Doctors" .... Alex Leaman (1 episode, 2004)
- Catchy Monkey (2004) TV episode .... Alex Leaman
Harry Potter and the Prisoner of Azkaban (2004) .... Slytherin Boy
... aka Harry Potter and the Prisoner of Azkaban: The IMAX Experience (USA: IMAX version)
"Waking the Dead" .... Teenage Tanner (1 episode, 2003)
- Breaking Glass: Part 1 (2003) TV episode .... Teenage Tanner
Spin (2002) .... Brad
Pure (2002) .... Tom
Out of Control (2002) (TV) .... Charlie-Boy
"The Bill" .... Boy On Bike / ... (2 episodes, 1999-2002)
- 007 (2002) TV episode .... Boy On Bike
- All Change (1999) TV episode .... Ricky
"Harry and Cosh" .... Bronson (1 episode, 2001)
- Poolside Romp (2001) TV episode .... Bronson


"Hope & Glory" .... Jake Deus (2 episodes, 1999)
... aka Hope and Glory (UK: new title)
- Episode #1.5 (1999) TV episode .... Jake Deus
- Episode #1.1 (1999) TV episode .... Jake Deus
"The Famous Five" .... Edgar (1 episode, 1996)
... aka Enid Blyton's Famous Five (International: English title: complete title)
- Five Run Away Together (1996) TV episode .... Edgar

Self:
Hey

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