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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: fat is faster
Date: 12 Feb 2025 19:39:13 GMT
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Frank Krygowski <frkrygow@gXXmail.com> wrote:
> On 2/11/2025 9:28 PM, AMuzi wrote:
>> On 2/11/2025 8:11 PM, Frank Krygowski wrote:
>>> On 2/9/2025 5:32 PM, AMuzi wrote:
>>>> On 2/9/2025 3:54 PM, cyclintom wrote:
>>>>> On Sat Feb 8 22:29:16 2025 Roger Merriman  wrote:
>>>>>> That Dylan Johnson has been doing some limited testing to find the 
>>>>>> fastest
>>>>>> Gravel tyres, which is larger than most folks would think.
>>>>>> 
>>>>>> though does as he notes depend on you and your riding, my Gravel 
>>>>>> riding is
>>>>>> often mixed use, and I like it?s adaptability, which would be 
>>>>>> compromised
>>>>>> with much larger tyres ie be more draggy on the tarmac.
>>>>>> 
>>>>>> Though if you?re just riding on the trails then a 2.1/50mm tyre is 
>>>>>> almost
>>>>>> certainly a better choice, I personally like being able to ride
>>>>>> tarmac/mud/roots etc which the all road/Gravel bike I have does 
>>>>>> fine, it
>>>>>> gives a bit to mates with newer bikes with wider clearances but it?s
>>>>>> certainly not enough to tempt me to a new bike!
>>>>>> 
>>>>>> And if it?s really narly can just use the MTB which just flattens 
>>>>>> stuff!
>>>>>> 
>>>>>> <https://youtu.be/iq9ydwkRt0Q?si=eX_6lRdPWtLwjh4k>
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> On my gravel bike I had 38 mm tires. Going fatter would have gained 
>>>>> nothing unless the terrain changed from gravel to wild MTB.
>>>> 
>>>> As noted, we all have our political preferences and our own analyses 
>>>> of agreed facts. Such is life.
>>> 
>>> I'll note, as usual, that some things actually are measurable.
>>> 
>>> 
>> 
>> For whatever criteria you deem significant.
> 
> Of course. For tires, it's commonly (but not always) rolling resistance 
> in the real world on a specific type of surface. Traction might be another.
> 
That’s a roadie perspective, my MTB tyres are slow rolling, on roads be
that tarmac or even fire roads they are pigs to pedal each one is 1KG plus,
have soft tacky compounds and so on, but once in the terrain they are
designed for they shine, Magic Mary (Front) is total grip monster,
particularly in wet loamy conditions. Hans Dampf is bit quicker rolling and
more middle of the road in terms of wet or hard pack terrain, hence it’s a
common pairing with the Mary up front.


> Sometimes it can be tricky to specify the criteria or design the tests, 
> but some things are certainly measurable. And I tend to trust measured 
> data more than mere opinions.
> 
Certainly with MTB tyres can be feel or predictability, the Maxxis Minion
DHF has a gap between the shoulders and the main tread the grip levels are
huge, but you have to commit ie bank the bike on to the shoulders and trust
that it will grip, it’s one of the reasons for their newer DH/Burly trail
tyre the Assegai which has like most tyres transition nobs and the DHF
doesn’t though it’s absolute grip is very high no evidence that the Assegai
has greater grip but it’s much more accessible.

Ie feel of tyre absolutely does matter in those situations, I certainly
noticed the Mary squarer profile on tarmac the MTB feels even more out of
its element than it did with Hans front and rear.

Roger Merriman