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.
>>>>
>>>>
>>>>
>>>
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