Tubed Clinchers: 25mm or 28mm?
11-20-19, 03:17 PM
#51
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Just to muddy the waters a bit more, here's an interesting article on tire width/pressure: https://www.roadbikerider.com/the-ti...-jan-heine-d1/
11-20-19, 03:45 PM
#52
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First of all, to go fast, you will generally want a skinny tire (23-25mm) pumped up to high psi. This is generally true for glassy smooth road.
But you said you also have chipseal road. Well, what percentage of the road is chipseal? If it's a 50/50 glassy vs chipseal, then I'd go with a 28mm to tame the chipseal, but you'll be slow on the glassy.
If 80% of the roads are glassy, then I'd go with a 25mm tire for speed.
But you said you also have chipseal road. Well, what percentage of the road is chipseal? If it's a 50/50 glassy vs chipseal, then I'd go with a 28mm to tame the chipseal, but you'll be slow on the glassy.
If 80% of the roads are glassy, then I'd go with a 25mm tire for speed.
11-21-19, 10:33 AM
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"To simplify the thread" and to keep this thread from becoming a rabid anti-tubeless / anti-tube festival, I decided not to talk about the reasons. (There are plenty of those threads elsewhere.) I could anticipate the potential thread-jack.
But no, the wheelset is not incompatible. It's a Mavic UST wheelset.
But no, the wheelset is not incompatible. It's a Mavic UST wheelset.
11-21-19, 11:11 AM
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I run tubed Conti GP5000s, 23mm in front and 25mm in rear. Unless you have modern wide aero rim, a 23mm in front is the way to go for aerodynamics and that was my rationale for it.
If it’s not comfortable enough, drop 5 psi at a time until it is, imo. 100 psi in front and 95 in rear is enough for comfort on multi hour rides over roads of various quality, and I use 5-10 psi more for nice, smooth roads.
If it’s not comfortable enough, drop 5 psi at a time until it is, imo. 100 psi in front and 95 in rear is enough for comfort on multi hour rides over roads of various quality, and I use 5-10 psi more for nice, smooth roads.
Last edited by Branko D; 11-21-19 at 11:23 AM.
11-21-19, 01:53 PM
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It seems a lot of BF is now on a bandwagon that's claiming comfort is king. No longer is priority performance, but cushiness. 15% drop used to be determinant of 'proper'. Now we hear that 100psi for tubed 25mm tire is overkill? (though it probably is for a front tire, I think most 15% drop calculators ask for about 100psi for a ~160lb rider).
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11-21-19, 02:26 PM
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That crr improvement on a TT front wheel at near 25mph plus is more than gone by the aero penalty of running a big tire.
Of course not for 19mm. But I’d say the aero holy grail for a light enough rider to balance with crr is still 23mm for TT.
Road in a group. Crr will save more probably in practice due to being in draft and on hills a lot. So 25 for non TT.
Of course not for 19mm. But I’d say the aero holy grail for a light enough rider to balance with crr is still 23mm for TT.
Road in a group. Crr will save more probably in practice due to being in draft and on hills a lot. So 25 for non TT.
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