20 November 2008
a while ago
a little bike project happened... when it was still sunny in amsterdam. wow that was a while ago :-D
18 November 2008
the skinny bridge
so eventually u stop fighting it and just let people take photos of you. often theyre kind enough to send them to you. this was a marvellous place to spend my lunch break...
Grotere kaart weergeven
kinda like this one: "When I see an adult on a bicycle, I do not despair for the future of the human race... cycle tracks will abound in Utopia." H.G. Wells. i stole it from here.
15 November 2008
13 November 2008
fixies and maths
when youre picking your next chainring or cog, its important to know how many skid patches the resulting combination will leave u with... ok im assuming two things here: firstly you dont have all the money in the world and enough time to go with it to keep changing your back tire, and secondly that you use your back tire to stop, not your front rim or something similarly silly. so here is a list of relevant prime numbers
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71
currently i ride a 51-19. jees i thought 51 was a prime number..? noddy badge for anyone who can tell me what it is divisible by (other than 1 and itself). apparently it still gives me 19 skid patches (according to the application on my mate's iphone that is). thats kinda cost effective, no?
found this on an irish forum, so im not the only one talking about it:
"You will never get more skid patches than the number of teeth on your sprocket, (you may get less, depending on the chainring) so more teeth is always better in that regard. You can get up to the max skid patches with a non-prime sprocket, you just have a wider range of possible chainrings with a prime sprocket (and vice versa.) A 47T chainring will give you the most possible skid patches with any rear sprocket, so it could be a very good choice."
why do almost all off the shelf fixies come with a 48-18 then? only 3 skid patches, unless ur an ambi-skidder... i guess they also come with brakes
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71
currently i ride a 51-19. jees i thought 51 was a prime number..? noddy badge for anyone who can tell me what it is divisible by (other than 1 and itself). apparently it still gives me 19 skid patches (according to the application on my mate's iphone that is). thats kinda cost effective, no?
found this on an irish forum, so im not the only one talking about it:
"You will never get more skid patches than the number of teeth on your sprocket, (you may get less, depending on the chainring) so more teeth is always better in that regard. You can get up to the max skid patches with a non-prime sprocket, you just have a wider range of possible chainrings with a prime sprocket (and vice versa.) A 47T chainring will give you the most possible skid patches with any rear sprocket, so it could be a very good choice."
why do almost all off the shelf fixies come with a 48-18 then? only 3 skid patches, unless ur an ambi-skidder... i guess they also come with brakes
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