Perhaps we should develop our own quantitative metric for the narrowness of
the hair being split? Inspired by the well known engineering unit the RCH.
SHPI -- splittable hairs per inch?
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.
>>>>>
>>>>>
>>>>>
>>>>
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