Comments on: 36 Inch Wheels: Update Part II http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/ 29er Bike Reviews, Rumors and News Mon, 08 Sep 2008 12:13:20 +0000 http://wordpress.org/?v=2.5.1 By: MudSpot http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-37290 MudSpot Mon, 31 Mar 2008 19:50:02 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-37290 I got to ride a prototype 36er singlespeed (built by Jeff Anderson - kiwibikes@xtra.co.nz) in the weekend, and will give it a good off road test in a couple of weeks. Then will get one made for myself. Im 6'7" and keen to put some 200 or 210 cranks on it. It already has a high EBB and plenty of wheel clearance. Can anyone tell me who makes cranks of that size. If I find single speed too difficult I may 1 x 9 speed it later. I will post more details and photos soon. It does have extra wide custom hubs which are beautiful Off for a weeks riding on the small wheeled 29er. I got to ride a prototype 36er singlespeed (built by Jeff Anderson - kiwibikes@xtra.co.nz) in the weekend, and will give it a good off road test in a couple of weeks. Then will get one made for myself. Im 6′7″ and keen to put some 200 or 210 cranks on it. It already has a high EBB and plenty of wheel clearance. Can anyone tell me who makes cranks of that size. If I find single speed too difficult I may 1 x 9 speed it later.
I will post more details and photos soon. It does have extra wide custom hubs which are beautiful
Off for a weeks riding on the small wheeled 29er.

]]> By: Art http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35840 Art Wed, 27 Feb 2008 23:46:44 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35840 I kind of get where you're going. The amount of heat generated is going to be the same. You are still decelerating the same mass at the same rate. On one hand, a given piece of the rotor will have more time to cool off before it gets back to the caliper, but it also had more time to pick up heat energy when it went through the caliper in the first place. That might even be worse in terms of making the rotor warp, but that's a lot of calculation I haven't done yet. I kind of get where you’re going. The amount of heat generated is going to be the same. You are still decelerating the same mass at the same rate. On one hand, a given piece of the rotor will have more time to cool off before it gets back to the caliper, but it also had more time to pick up heat energy when it went through the caliper in the first place. That might even be worse in terms of making the rotor warp, but that’s a lot of calculation I haven’t done yet.

]]> By: MudSpot http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35839 MudSpot Wed, 27 Feb 2008 23:33:28 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35839 Thanks for those answers Art and Bryan. What about this for a theory. The big wheels are going to rotate slower (relative to a 26 inch wheel) at the same speed so the rotor is rotating slower and therefor producing less friction heat when braking, which offsets any additional heat that Art has mentioned. Another way to look at it is your braking the same mass (rider plus bike) irrespective of wheel size, so brake demand dosent change, and rotor heat dosent change. Dunno, getting a little to scientific for me, but love to question these things. In the process of getting a 36er built, hence the interest in these discussions. I am 6'7" so big wheels wont look so freakish. (less freakish than me on 26" wheels) Thanks for those answers Art and Bryan. What about this for a theory. The big wheels are going to rotate slower (relative to a 26 inch wheel) at the same speed so the rotor is rotating slower and therefor producing less friction heat when braking, which offsets any additional heat that Art has mentioned. Another way to look at it is your braking the same mass (rider plus bike) irrespective of wheel size, so brake demand dosent change, and rotor heat dosent change. Dunno, getting a little to scientific for me, but love to question these things.
In the process of getting a 36er built, hence the interest in these discussions. I am 6′7″ so big wheels wont look so freakish. (less freakish than me on 26″ wheels)

]]> By: Art http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35835 Art Wed, 27 Feb 2008 21:39:55 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35835 Thanks for the details Bryan. That thing's got to be a blast to ride. I agree with the dual disks. A 36" wheel is going to take about 38% more hub torque to put the same traction to the ground as a 26" wheel. That gives a single 203mm rotor on the 36" about the same stopping power as a 140mm on the 26". Throw in some extra weight and a nearly endo-proof wheelbase that lets you brake right up to the traction limit and you're just asking that single disk to overheat. Thanks for the details Bryan. That thing’s got to be a blast to ride. I agree with the dual disks. A 36″ wheel is going to take about 38% more hub torque to put the same traction to the ground as a 26″ wheel. That gives a single 203mm rotor on the 36″ about the same stopping power as a 140mm on the 26″. Throw in some extra weight and a nearly endo-proof wheelbase that lets you brake right up to the traction limit and you’re just asking that single disk to overheat.

]]> By: keener http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35833 keener Wed, 27 Feb 2008 20:42:31 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35833 Art The wide hub bike has a 122.5 mm bb axle that is spaced to the right 3.5 mm. The two chain rings run right of the spider. The chain just clears the crank arm on the 34 tooth ring. Chain line is stright to the rear to better then +/- .2mm. The chain stays are 20" long , short ish for a 36" bike, still not long enough to forgive bad chain line on a single speed. MudSpot The two rotors shair load better on the hub and spokes (IMHO). Braking loads are limited by tire friction. No flex has been reported in the wheels from my self or other test riders. I have some fun with what people think the 36" is good for, or not good for. As people get more seat time these things will work them selfs out. Right now the 29 is getting dusty as I have a new bike. And nothing rides like a new bike! Bryan Keener Art
The wide hub bike has a 122.5 mm bb axle that is spaced to the right 3.5 mm.
The two chain rings run right of the spider. The chain just clears the crank arm on the 34 tooth ring. Chain line is stright to the rear to better then +/- .2mm. The chain stays are 20″ long , short ish for a 36″ bike, still not long enough to forgive bad chain line on a single speed.

MudSpot
The two rotors shair load better on the hub and spokes (IMHO). Braking loads are limited by tire friction. No flex has been reported in the wheels from my self or other test riders.

I have some fun with what people think the 36″ is good for, or not good for. As people get more seat time these things will work them selfs out. Right now the 29 is getting dusty as I have a new bike. And nothing rides like a new bike!

Bryan Keener

]]> By: MudSpot http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35831 MudSpot Wed, 27 Feb 2008 20:22:41 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35831 I am assuming dual front disks means a rotor on each side of the hub. I would have thought this was excessive stopping power that would induce excessive stress in the long spokes. GT in his first report said the flex when braking was disconcerting and suggested smaller rotors. Any thoughts? I am assuming dual front disks means a rotor on each side of the hub. I would have thought this was excessive stopping power that would induce excessive stress in the long spokes. GT in his first report said the flex when braking was disconcerting and suggested smaller rotors. Any thoughts?

]]> By: Bikenelson http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35741 Bikenelson Tue, 26 Feb 2008 15:24:25 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35741 I started next to that "thing" in the Chequamegon 40. Not only is it a big ride, for a big guy, but the rider had a busted wing. Not sure about his overall time, but at least there are people out there pushing the envelope. I don't care what kind of biker you are, you will never be satisfied, so here's to you mister 36" man, RIDE ON! Does anyone know the weight of Big Blue? I started next to that “thing” in the Chequamegon 40. Not only is it a big ride, for a big guy, but the rider had a busted wing. Not sure about his overall time, but at least there are people out there pushing the envelope. I don’t care what kind of biker you are, you will never be satisfied, so here’s to you mister 36″ man, RIDE ON!

Does anyone know the weight of Big Blue?

]]> By: Cloxxki http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35681 Cloxxki Mon, 25 Feb 2008 17:11:12 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35681 @blackbean : the 36" size was established by the unicycle industry. Then it was used for cruiser bikes, and now this. If a cyclist would come up with a new size, 32" would indeed be a popular choice. I'd ride it, quite possibly as main ride. 29" is only big if you look in the past. If you look at the size of the average rider, it's only a start. @blackbean : the 36″ size was established by the unicycle industry. Then it was used for cruiser bikes, and now this. If a cyclist would come up with a new size, 32″ would indeed be a popular choice. I’d ride it, quite possibly as main ride.
29″ is only big if you look in the past. If you look at the size of the average rider, it’s only a start.

]]> By: Cloxxki http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35664 Cloxxki Mon, 25 Feb 2008 07:34:04 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35664 Art, the longer stays make the cain angle less drastic, I would guess. Also, one can mount a 32t on the outer position, plenty of drive. Art, the longer stays make the cain angle less drastic, I would guess. Also, one can mount a 32t on the outer position, plenty of drive.

]]> By: Art http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35649 Art Sun, 24 Feb 2008 23:43:08 +0000 http://twentynineinches.com/2008/02/23/36-inch-wheels-update-part-ii/#comment-35649 Nice. Any word on whether those hubs necessitate an extra wide bottom bracket? Nice. Any word on whether those hubs necessitate an extra wide bottom bracket?

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