When I put on my Compass tires for the first time I sure as heck noticed the difference. Vittorias always seemed harsh and uninvolved. Compass smooth engaging. Not sure how those impressions could be measured under controlled conditions with power impressions.
On Sunday, September 6, 2015 at 11:20:16 PM UTC-5, hangtownmatt wrote: > > Seems to me that if differences can only be detected under carefully > controlled conditions using power meters none of these tires are worth all > the fuss and expense. I'll stick with my $20 Vittoria Randonneur's. > > Matt > > On Sunday, September 6, 2015 at 12:22:40 PM UTC-7, Jan Heine wrote: >> >> >> We'll consider the Furious Fred and Thunder Burts when we next test tires >> on the track with a power meter under carefully controlled conditions. >> Thank you for the suggestion. >> >> Best, >> >> Jan Heine >> Editor >> Bicycle Quarterly >> www.bikequarterly.com >> >> On Sunday, September 6, 2015 at 1:31:05 PM UTC+2, Takashi wrote: >>> >>> Thank you Jan. >>> I have enjoyed reading your articles in blog and BQ, and they inspired >>> me to do the test. >>> As an amateur cyclist, my time to ride bike is limited, so I cannot say >>> for sure how many times I will ride the same route. >>> I like to visit places I have never seen, rather than riding same route >>> over and over. >>> (I'm pretty sure that most people in this group understand this >>> inclination) >>> Still, I am interested in performances of tires myself, so when I do >>> further test, I will post about it. >>> >>> I have read in your blog (comment section maybe) that you consider >>> Furious Fred and Thunder Burt as too much off-road-oriented, but I think >>> they were very smooth and efficient on pavement. >>> So I am expecting to read reviews of those tires in future issues of BQ. >>> >>> Takashi >>> >>> >>> 2015年9月5日土曜日 15時15分36秒 UTC+9 Jan Heine: >>>> >>>> Takahashi, >>>> >>>> That is an interesting comparison. Like you, I am surprised that our >>>> Barlow Pass tires weren't super-fast. At first, I thought about why this >>>> could be... until I realized that you did only one run with each tire. You >>>> mention that yours isn't a detailed study, and you are right. It would be >>>> erroneous to draw conclusions based on a single run, especially on a road >>>> course where so many variables can change. >>>> >>>> It's very important to control all the variables when testing tires. >>>> For example, at Bicycle Quarterly, we test on a track, and only when there >>>> is no wind (measured with a windspeed meter, < 0.5 m/s; but looking at >>>> trees and checking that the leaves don't move is equally precise). We also >>>> measure temperature and correct for that based on a curve we've >>>> established >>>> by measuring the same tires at different temperatures. We do at least >>>> three >>>> repeats with each setup. >>>> >>>> On an open-road course, you'll have many more variables that change. >>>> The way to deal with this is to do repeat runs until the variations >>>> average >>>> out. A statistical analysis helps you figure out whether you've reached >>>> that point. (Bicycle Quarterly's tests always include a statistical >>>> analysis to make sure we report actual differences between tires, rather >>>> than just "noise" in the data.) >>>> >>>> So I encourage you to do more test runs with at least some of the >>>> tires, and then do a statistical analysis. If you need help with that, we >>>> can help. (BQ contributor Mark Vande Kamp has a Ph.D. with a minor in >>>> statistics.) >>>> >>>> In the mean time, rather than looking at numbers, it may be more useful >>>> to report your impressions of riding each tire. How did they feel >>>> different >>>> on each section of your course? Which one was more fun to ride? In the >>>> end, >>>> that is what counts for most of us when we ride. >>>> >>>> Again, thank you for doing the testing. Please continue the experiment >>>> until you get meaningful numbers. It's of great interest to all of us how >>>> these tires perform. >>>> >>>> Jan Heine >>>> Compass Bicycles >>>> www.compasscycle.com >>>> >>> -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
