Super_mil Posted October 4, 2012 Posted October 4, 2012 Seems like they are quite strong... http://www.youtube.com/watch?v=0M7H85x_Fyk
Peach. Posted October 4, 2012 Posted October 4, 2012 WOW, that was a hard landing.But 650b is still stupid.
Tumbleweed Posted October 4, 2012 Posted October 4, 2012 Will the 650B wheels be a disadvantage when it gets windy?
TNT1 Posted October 4, 2012 Posted October 4, 2012 Whenever I see this red bull sponsored stuff, I think X Fighters... http://static.stayontheblack.com/uploads/2012/10/XFW_AUS_SHEE_SM_3913.jpg
patches Posted October 4, 2012 Posted October 4, 2012 Will the 650B wheels be a disadvantage when it gets windy? yup! As described in 2008 (Semenuk I think said it), the wheels act like giant sails. So when it gets windy, 26" sails are bad enough! When it comes to "rolling over stuff" 29" is actuallt only 1.5" increase (in radius) over 26" and 650B would only be 0.75" increase... but when it comes to surface area. 29" = 661 in227.5" = 594 in226" = 530 in2 So when it comes to wind resistance, a 29er has approx 25% more wind resistance than a 26"a 650b has approx 12% more wind resistance than a 26" and that's not even considering the extra gyroscopic forces that larger wheels produce. So now you know why there aren't 29" dirt jump bikes! Peach. 1
Tumbleweed Posted October 4, 2012 Posted October 4, 2012 yup! As described in 2008 (Semenuk I think said it), the wheels act like giant sails. So when it gets windy, 26" sails are bad enough! When it comes to "rolling over stuff" 29" is actuallt only 1.5" increase (in radius) over 26" and 650B would only be 0.75" increase... but when it comes to surface area. 29" = 661 in227.5" = 594 in226" = 530 in2 So when it comes to wind resistance, a 29er has approx 25% more wind resistance than a 26"a 650b has approx 12% more wind resistance than a 26" and that's not even considering the extra gyroscopic forces that larger wheels produce. So now you know why there aren't 29" dirt jump bikes! Thanks for the physics lesson. Yeah, remember Semenuk talking about the former sniper giving him advice on when the wind would drop?
patches Posted October 4, 2012 Posted October 4, 2012 Thanks for the physics lesson. Yeah, remember Semenuk talking about the former sniper giving him advice on when the wind would drop? My pleasure, I know not all of us got to finish primary school
Peach. Posted October 4, 2012 Posted October 4, 2012 yup! As described in 2008 (Semenuk I think said it), the wheels act like giant sails. So when it gets windy, 26" sails are bad enough! When it comes to "rolling over stuff" 29" is actuallt only 1.5" increase (in radius) over 26" and 650B would only be 0.75" increase... but when it comes to surface area. 29" = 661 in227.5" = 594 in226" = 530 in2 So when it comes to wind resistance, a 29er has approx 25% more wind resistance than a 26"a 650b has approx 12% more wind resistance than a 26" and that's not even considering the extra gyroscopic forces that larger wheels produce. So now you know why there aren't 29" dirt jump bikes! And it pretty much windy every day haha
Tumbleweed Posted October 4, 2012 Posted October 4, 2012 My pleasure, I know not all of us got to finish primary school Hey, I stayed in primary school fopr all those years cos my teacher was hot.
Azonic Posted October 4, 2012 Posted October 4, 2012 a 29er has approx 25% more wind resistance than a 26"a 650b has approx 12% more wind resistance than a 26" Saw same thing in Trans Baviaans when crossing rivers while riding. The water force nearly pushes the bike out from under you on a 29er, there is more rubber for the water to push against compared to a 26er...
patches Posted October 4, 2012 Posted October 4, 2012 Saw same thing in Trans Baviaans when crossing rivers while riding. The water force nearly pushes the bike out from under you on a 29er, there is more rubber for the water to push against compared to a 26er... yup! and despite a wheel being more air than spoke, when it is rotating it becomes almost solid. For those that don't believe me... spin your wheel and try quickly put your finger between the spokes and pull it back again without touching anything. So yeah, it's not only the bigger surface area of the rubber that is affected by the wind/water, but basically the entire wheel.
Eldron Posted October 4, 2012 Posted October 4, 2012 (edited) When it comes to "rolling over stuff" 29" is actuallt only 1.5" increase (in radius) over 26" and 650B would only be 0.75" increase... Not sure where you got your intel from but someone is telling porky pies. The legendary Sheldon Brown has this to say: 26 diam = 559mm650b diam = 584mm29 diam = 622mm 650b is 25mm or 1" bigger than 26" wheel - 0.5" in radius. Edit: on a different subject - personally I think 650A would have been a better size to adpot than 650B - at least it's closer to halfway between than 1/3... Edited October 4, 2012 by Eldron
Tumbleweed Posted October 4, 2012 Posted October 4, 2012 (edited) Not sure where you got your intel from but someone is telling porky pies. The legendary Sheldon Brown has this to say: 26 diam = 559mm650b diam = 584mm29 diam = 622mm 650b is 25mm or 1" bigger than 26" wheel - 0.5" in radius. Edit: on a different subject - personally I think 650A would have been a better size to adpot than 650B - at least it's closer to halfway between than 1/3... So much for patches' "primary school" comment… Edited October 4, 2012 by Tumbleweed
Eldron Posted October 4, 2012 Posted October 4, 2012 yup! and despite a wheel being more air than spoke, when it is rotating it becomes almost solid. For those that don't believe me... spin your wheel and try quickly put your finger between the spokes and pull it back again without touching anything. So yeah, it's not only the bigger surface area of the rubber that is affected by the wind/water, but basically the entire wheel. Let the primary school edumacation continue....when passing through water wheels are not spinning - relative to the ground they are stationary so the "sail" concept does not hold *ahem* water for when wheels move through water. *snigger*
patches Posted October 4, 2012 Posted October 4, 2012 Not sure where you got your intel from but someone is telling porky pies. The legendary Sheldon Brown has this to say: 26 diam = 559mm650b diam = 584mm29 diam = 622mm 650b is 25mm or 1" bigger than 26" wheel - 0.5" in radius. I just took the diameters at "face value" to give a basic illustration of surface area increase proportinal to diameter increase. I'm too lazy for exact science
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