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On Wednesday, April 18, 2012 10:07:07 AM UTC-7, HappyCamper wrote: > > You can say that every post on this group ever has been splitting hairs. > It's part of the fun :) > > - Ryan > > > > > > On Wednesday, April 18, 2012 10:03:07 AM UTC-7, Jim Thill - Hiawatha > Cyclery wrote: >> >> MichaelH illustrates how little difference it makes. Three minutes is his >> largest variation in his 18 mile ride on a variety of different tires with >> different bikes, and that variation wasn't even reproducible in a second >> trial. I spent seven years in grad school doing science, so I can see that >> there are confounding factors in Michael's research that muddy the waters. >> But his over all consistency from tire to tire and bike to bike suggests >> (if not proves) that tire differences play much less role than, say, the >> rider's day to day energy level and attitude, wind direction, and countless >> other factors. Comparing one lightweight 700x28 tire to another is really >> splitting hairs. >> >> On Tuesday, April 17, 2012 7:16:05 PM UTC-5, MichaelH wrote: >>> >>> Another single data point. >>> >>> Along with the post on where the Rambouillet fit in the Riv line up, I >>> rode an 18 mile loop from my home on my Ram with a pair of Continental GP4, >>> 23 mm tires. (A gift). The course has 900 feet of climbing and includes >>> 4-5 miles of dirt roads, with the rest equally divided among good pavement, >>> bad pavement, and atrocious pavement. After the ride I recorded my time & >>> subjective impressions (painful). I also discovered a cut in the sidewall >>> of the rear tire, so I decide to replicate the ride with a variety of bikes >>> and ties. I rode it twice on my Ebisu with Jack Browns. The first ride >>> was 3 minutes slower but the second was identical, although a lot more >>> comfortable. I rode it once with my Trek & T Serve (30mm actual). My time >>> was right between the faster and slower rides & the comfort just a nudge >>> below the JB. Now the wind has shifted around from the south to the west ( >>> it has been blowing at 20 -25 mph, making this very real world test) and >>> the dirt road has been graded, leaving it's surface full of rocks and loose >>> sand, so it's really hard going now. Hard to make comparisons. I'm in >>> Boston for the weekend and heavy rain forecasted for next week so this test >>> will be suspended for a while. >>> >>> I'm not sure where this leaves me. I'd like to put the Grand Bois Green >>> on my ram but am wondering if the perceived advantage is worth the added >>> flats. >>> >>> Michael >>> >>> On Tuesday, April 17, 2012 4:29:48 PM UTC-4, William wrote: >>>> >>>> I'm in the same boat with Pari-Motos. I flat almost every ride with >>>> Pari-Motos, and almost never with anything else. I've put them back on >>>> with Foss tubes to try again. I like the ride of them, but the flat >>>> record >>>> is pretty bad for me. For me it's been glass. >>>> >>>> On Tuesday, April 17, 2012 12:55:06 PM UTC-7, Mojo wrote: >>>>> >>>>> Prompted by this thread I changed out the Rolly Poly/Ruffy Tuffy >>>>> front/rear combo on my road bike wheels to the pair of (what I have >>>>> considered to be special event) Grand Bois Cerf 28mm tires. I rode them >>>>> for >>>>> 25 mountainy miles yesterday and enjoyed their feel immensely. Today I >>>>> got >>>>> a front goathead flat. This is the 3rd flat I have had on these tires in >>>>> about a dozen rides. This is by far the worst flat record of any tire I >>>>> have used, ever. I understand I cannot say this will be the flat record >>>>> for >>>>> me in the future or for you in your environment, but my faith in the tire >>>>> is shaken and it affects the enjoyment of my ride. I am putting more >>>>> effort >>>>> into scanning the road or trying to stay off the dirtier portions of the >>>>> road instead of enjoying the view or thinking my deep thoughts. {~; >>>>> . >>>>> When I got home I fixed the flat, pulled the GB Cerfs and replaced >>>>> them with the RP/RT combo. As I was changing them, I weighed them on my >>>>> Park digital spring scale. To the nearest ounce, the Cerf was 10oz, Rolly >>>>> Poly 11oz, Ruffy Tuffy 13oz, Jack Brown Green 33mm was 12-13oz. All of >>>>> these tires are made by Panasonic. Now I believe Jan Heine's rollout tire >>>>> comparisons are valid. But for me to flat every second or third ride is >>>>> just not worth the lower rolling resistance or an ounce or two of >>>>> rotating >>>>> weight. >>>>> >>>>> >>>>> >>>> -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/JHv3MEUq4RMJ. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.