tag:blogger.com,1999:blog-6080071290235905056.post6188798829628205642..comments2024-02-27T18:30:46.362-08:00Comments on Blather 'bout Bikes: Win Tunnel Playtime - Part 3 (The "After Party")Tom Anhalthttp://www.blogger.com/profile/08175472546482777614noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-6080071290235905056.post-832356326900577862020-07-09T15:16:30.471-07:002020-07-09T15:16:30.471-07:00This comment has been removed by the author.Greg Prosmushkinhttps://www.blogger.com/profile/06469085569109130005noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-23509943836345865722016-07-28T03:23:09.639-07:002016-07-28T03:23:09.639-07:00Have you considered calculating estimated factor t...Have you considered calculating estimated factor that would account for the used tire size (volume, not just width) and effect of tire pressure on CRR. Because most presumably 25mm tire will roll better (on smooth surface) when inflated to 120psi than similar 23mm tire. <br /><br />Or what do you think that would be reasonable when testing different sized tires and trying to factor in the effect of tire pressure?<br /> <br />Though CRR-charts for a tire tested with different inflation pressures don't show that great variance in CRR if the difference in pressure isn't huge.Anonymoushttps://www.blogger.com/profile/12677693299939980130noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-26733780252667147132016-07-25T07:33:39.773-07:002016-07-25T07:33:39.773-07:00The original Flo 90. The new ones didn't exist...The original Flo 90. The new ones didn't exist at the time.Tom Anhalthttps://www.blogger.com/profile/08175472546482777614noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-50790355516057376672016-07-24T22:26:52.706-07:002016-07-24T22:26:52.706-07:00Perhaps I missed it but which FLO 90 did you use? ...Perhaps I missed it but which FLO 90 did you use? I know it's been updated in the last year or so. Thanks!Anonymoushttps://www.blogger.com/profile/18140228035398312314noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-51229403795246250532016-07-16T00:20:30.298-07:002016-07-16T00:20:30.298-07:00This comment has been removed by the author.Anonymoushttps://www.blogger.com/profile/18140228035398312314noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-41873085344833242016-06-21T19:51:40.672-07:002016-06-21T19:51:40.672-07:00Interesting to see Roval with Supersonic...Interesting to see Roval with Supersonic...Unknownhttps://www.blogger.com/profile/09490216642348598598noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-24615886698184671232016-05-19T07:56:42.648-07:002016-05-19T07:56:42.648-07:00Super work thanks so much for sharing
I've 2 ...Super work thanks so much for sharing <br />I've 2 options for front wheel for tt and track pursuit outdoor track<br />Hed 3 clincher currently bont aerowing but changing to conti supersonic<br />And a enve ses 6 with 24mm spec turbo cottons <br />Both latex tubes and riding s5 set up as tt bike speed for tt Apx 42/43kph depending on distance .. Pursuit obviously quicker <br />Would you hazard a guess as to which should be my go to front wheel<br />Thanks again Anonymoushttps://www.blogger.com/profile/12303688024119990151noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-70602284623808804132016-03-11T14:14:24.949-08:002016-03-11T14:14:24.949-08:00I have them on order. If I get them before you I ...I have them on order. If I get them before you I would be happy to send one in for testing. Austinhttps://www.blogger.com/profile/04911347152711327605noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-37377029093171816182016-03-11T12:51:40.769-08:002016-03-11T12:51:40.769-08:00Hi Austin,
Yes, the Crr calculations include an &q...Hi Austin,<br />Yes, the Crr calculations include an "on road" factor already. I use 1.5X over the smooth roller results since that is what I've measured for my roads around here. That's also consistent with the 1.3-1.4X found by Andy Coggan. <br /><br />I too am curious to see how the new Corsa Speed performs. There seems to be conflicting info on just how good it is...but, the rollers don't lie ;-)Tom Anhalthttps://www.blogger.com/profile/08175472546482777614noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-74813303659245312652016-03-11T09:45:10.487-08:002016-03-11T09:45:10.487-08:00This is great stuff. Thank you! Looks like I wil...This is great stuff. Thank you! Looks like I will be retiring my SWorks turbo 22 after one ride. The supersonic and turbo cotton rule the combined tests. I am curious if your roller tests are adjusted for real world surfaces or not. Do you believe a multiplier of the Crr is appropriate? I suspect that would only widen the gap.<br /><br />I am very interested to see if the Vittoria Corsa Speed falls into the fast category. Having a similar construction as the TC, but in a slightly narrower package might make it a fantastic TT tire. Austinhttps://www.blogger.com/profile/04911347152711327605noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-34789076507724779322016-03-10T08:56:51.379-08:002016-03-10T08:56:51.379-08:00I'd be curious to see how you worked out the v...I'd be curious to see how you worked out the vectors<br />Stevehttps://www.blogger.com/profile/14258906558146401612noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-85211444706803094752016-03-09T16:10:15.558-08:002016-03-09T16:10:15.558-08:00Hi Steve, Thanks! Yeah...you're probably right...Hi Steve, Thanks! Yeah...you're probably right about the extra work ;-)<br /><br />The only downside of a tool like you describe is getting the wheel/tire combination data to pull that off. That's a lot of data and time.<br /><br />The Open Pro measures just under 15mm. I had done some tests previously with a "mid" width rim (Zipp 101) and couldn't really tease out any Crr differences from the measurement noise. It seems like it has taken the REALLY wide rim like the 21mm internal width Jet+ to start seeing that effect on the rollers.Tom Anhalthttps://www.blogger.com/profile/08175472546482777614noreply@blogger.comtag:blogger.com,1999:blog-6080071290235905056.post-13691554976441247002016-03-09T07:35:43.956-08:002016-03-09T07:35:43.956-08:00Tom, Outstanding, though I dare say you've jus...Tom, Outstanding, though I dare say you've just opened yourself up to a whole lot of added work. How generalizable do you think the results are to other tires you've tested? <br /><br />If/when/over time you can get around to it, it would be wonderful if you could come up with a tool where one could plug in load, speed, tire model, tire width and get combined CdA and Crr plots as you have done with the Specialized ones above. Assuming the tire width is the primary variable of aero performance at a given speed, load, rim width and less dependent on brand (a crude assumption but don't know whether others will be as accommodating as Specialized in providing you aero results) and the Crr differences you will develop with your new wider rim, 100psi testing, then would something like that be doable? <br /><br />My only other comment is that going from the Open Pro inside width (13mm?) to the Jet+ (20.6mm) rim for testing is a huge jump. Perhaps another width representative of the 17C alloy and 19C carbon wheelsets that are more standard today might be worth considering in addition or instead of these. <br /><br />Best, SteveSteve@intheknowcycling.comhttps://www.blogger.com/profile/16189668733741295992noreply@blogger.com