#31
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#32
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Any tire pressure scheme would be generally subject to this critique.
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Instagram - DannAdore Bicycles |
#33
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700x23 on the road, same width for the last 15 years.
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#34
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Once you get your particular distribution right IME you don't notice a squishy front tire when riding uphill, etc.. I think a lot of the time weight distribution shifting is probably overplayed. Pretty much no one can pull a wheelie at full speed on a road bike or even really shift the weight back. We spend an extremely small amount of time under really hard braking forces. The tires don't have much room to squish down to shift weight and we don't have suspension. Maybe under a full spring you put out enough power to shift weight back.. but we all get out of the saddle and transfer weight forward. I bet a lot of time we move our bodies around in ways that keep the distribution pretty even. It's nothing like a motorcycle where the front suspension will squat down multiple inches under hard braking very frequently and the motor has enough power to lift the front wheel under hard acceleration up to really high speeds. (And motorcycles have really wildly different weight distribution compared to bicycles anyway cause the motor shifts the weight forward greatly.) |
#35
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When I most notice the squish of too-soft tires is downhill cornering and hoofing up steep hills out of the saddle --- and when I most notice too-hard tires is riding in a straight line over rougher surfaces. Gotta a pick a middle-ground I guess and live with it |
#36
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38’s gravel - my frame won’t fit any bigger tires, but I’ve no complaints. Gets me through the rocky stuff... have yet to encounter any issues. Traction is solid.
25’s road - remarkably better than 23’s for my weight. Trying out some 28’s soon here though. We shall see. |
#37
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#38
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Quia tristis cervisia |
#39
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Jan's graph based on 15% drop is a really useful starting point. I think most of us will have a little fudge factor up or down based on preference and tire selection and such but the basic idea of calculating based on load on each tire is really sound. For me the last step was increasing the rear tire pressure.. I was generally running it too low cause I was reluctant to go all the way to a 60% rear/40% front setup. It does seem really extreme when you start trying his recommendations. But often when the rear was too low for some reason it was tricking me and making me think something was wrong with the front. |
#40
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How does that calculation vary based on rider weight?
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#41
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Corsas in a 23 at 95 & 100 psi. I'm 156 these days. The roads I ride are in very good condition.
Last edited by Hellgate; 09-20-2019 at 03:30 PM. |
#42
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It's based on this:
https://www.renehersecycles.com/wp-c...BQTireDrop.pdf I have a spreadsheet I made that adds lines for additional tire sizes & provides a worksheet for you to calculate it based on your inputs. (Put in your weight, weight of bike, weight distribution, etc..) I have shared the spreadsheet here before. I can try to do so again when I have access to it. For me most of the fiddling had to do with the issue that it's not that easy to get a real measure of weight distribution. You can supposedly do it with 2 identical scales but I don't have that. I have also been for bike fittings where the high end fit bikes will measure it for you as the fit changes.. that's a good way to get an accurate # but it ignores the weight distribution of your actual bike, your tools, water, etc.. |
#43
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I am also in the 28-30 for road riding camp. I prefer fat tubs like the Vlaanderens and 30mm Corsa Controls. They still feel zippy, but have the cushy of a 35mm supple clincher like a Bon Jon.
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#45
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Depends on the bike. My Drifter is running 35mm and they perform well on and off road. I ran 32s on my recently sold MRB and that performed exceptionally well with that setup.
My Great Divide sits on belgium+ with 28s and is my go to road bike. The Ottrott is on 25mm tires and still rides extremely well planted and comfortable and has room for 28s, but I just haven't felt a need for them. Sent from my LGL423DL using Tapatalk |
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