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Most recent activity

• Tourney: WHBPC 2012 - Geneva - 2012/08/14-18

  in Bike Polo • 12 years, 5 months

  

  25th place tie:
  ...
  Monkey Punch
  ...

  no comment :(

  -> anybody looking for a sub may ask monkey flo (facebook: florian mehrzweck)

  see you in geneva!

• DIY disc guards

  in Bike Polo • 12 years, 7 months

  

  in case there are still people looking for front rotor guards: my new rotor guards will be compatible with most is2000 forks. welded design, protects both rotor and caliper.
  in the picture, ignore the screw on the left as it can only be used on max power forks, while on any other fork the guard is clamped by the wheel and the screw that fixes the caliper (hole on the right)
  will be available in about 2 weeks, approx. 25gbp incl. shipping

  

• Polo Bikes

  in Bike Polo • 13 years

  

  forks are 120€=100gbp.
  both 26" (365mm a-t-c) or 700c (400mm) are possible, i just need to know which

• Polo Bikes

  in Bike Polo • 13 years

  

  speaking of forks, anyone in need of max power forks for 700c wheels? i'm going to bring a couple to london next weekend...

• Polo Bikes

  in Bike Polo • 13 years, 1 month

  

  the disc brake protectors for my bikes are 18£. they protect both rotor and the brake itself. although you can, it doesn't make any sense to buy them separately, as you don't have the interface on your bike. you can see the old version here http://www.maxpowercycles.de/builds/ (misses the protection for the brake itself)

  i'm just about to re-order, so if somebody might be interested in protectors that mount on is2000, i would make a new design for that. 18£ per piece. delivery time 2 weeks
  anyone?

• Polo Bikes

  in Bike Polo • 13 years, 2 months

  

  thanks guys!
  yes, it's the penis fork. i'll post some better pictures...

• Polo Bikes

  in Bike Polo • 13 years, 2 months

  

  26" versus 700c doesn't equate to lighter versus heavier

  -nerd mode on-
  it actually does, angular velocity and radius eliminate each other in the equation if you refer to a equal linear acceleration of the center of rotation
  -nerd mode off-

• Polo Bikes

  in Bike Polo • 13 years, 2 months

  

  ah yes, okay

• Polo Bikes

  in Bike Polo • 13 years, 2 months

  

  The way you've distributed your weight on your bike will have more effect on grip than a soft/hard compound tyre (for the most part).

  how do you mean?

• Polo Bikes

  in Bike Polo • 13 years, 2 months

  

  Please show where all the light grippy 26" tyres are.

  i ride a continental sport contact: http://www.conti-online.com/generator/www/de/en/continental/bicycle/themes/city/citytyres/sportcontact/sportcontact_en.html
  probably the lightest you will get

  bigger patch is more grippy ennit

  not at all

  softer compound is more grippy too

  mostly true, softer tires often have higher frictional coefficients

  more grippy will usually mean higher rolling resistance

  not necessarily

  Anyway, the long and the short of it is that no-one has been able to convincingly answer why some tires are more grippy, whether a smaller contact patch is more grippy than a bigger one etc etc. Probably because it's seriously complicated physics & also tire grip is serious trade secret stuff.

  this is quite simple in theory:
  
  that is: "maximum sideway friction" equals "frictional coefficient" multiplied by "force that is applied vertically to the ground".
  the frictional coefficient is the only part where the tire influences this equasion. it does NOT depend in any way on: tire surface, tire pressure, etc. it is a value that is determined in experiments (!) considering the two materials that are in contact, and outer influences, like lubrication (eg. water). rubbercompound x and tarmac have a certain coefficient. rubber compound x and wet tarmac have another coefficient. and so on.

  in reality, a bigger tire or less pressure and therefore a bigger surface might help you if there is debris on the court that makes you lose contact with the ground when you ride over it. but, as long as your tire is in contact with the ground somehow, surface doesn't matter for grip

  if you want more grip you have one option. get another rubber compound. a bigger tire won't help (at least not in theory, thats for sure)

  rolling resistance is even more experimental stuff than friction, i don't know enough about it to really beeing able to explain everything right. main thing is: rolling resistance increases exponentially as pressure gets lower. probably because: if you have lower tire pressure, your tire doesn't just roll in clean contact to the ground, but it gets warped constantly. this needs energy, which is then mostly transfered into heat.

  hope my poor technical english ins't too confusing