New wheels
Moderator: robbosmans
1mm here or there isn't going to make a huge difference. I would work backwards from which tire you want to run and buy a rim with a width that will accomodate that and fit your frame nicely.
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Better in which way? It just depends on your goals.
My guess is that on Campagnolo Boras (c17) most people are using a 25mm tire. I mean a tire that actually measures 25mm when installed. For example a 23mm Grand Prix 4000S measures out to 25mm. Some people probably use the next size up if it fits in their frame and they probably don't care about the few watts used up by a wider tire.
Whether you buy a 17mm internal rim or a 19mm internal rim is not going to make a huge difference. I have two wheelsets, one is 15mm internal and the other 19mm internal. I run the 23mm Grand Prixs on both (again, they measure around 25mm on the 15mm rim and 26mm on the wider rim). Both work fine. I get a little bit more volume on the 19mm internal rims. The difference is not earthshattering.
Like I said, start with the tires you want to run and work backwards.
My guess is that on Campagnolo Boras (c17) most people are using a 25mm tire. I mean a tire that actually measures 25mm when installed. For example a 23mm Grand Prix 4000S measures out to 25mm. Some people probably use the next size up if it fits in their frame and they probably don't care about the few watts used up by a wider tire.
Whether you buy a 17mm internal rim or a 19mm internal rim is not going to make a huge difference. I have two wheelsets, one is 15mm internal and the other 19mm internal. I run the 23mm Grand Prixs on both (again, they measure around 25mm on the 15mm rim and 26mm on the wider rim). Both work fine. I get a little bit more volume on the 19mm internal rims. The difference is not earthshattering.
Like I said, start with the tires you want to run and work backwards.
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ultimobici
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So I take it you think ETRTO guidelines are bunk?AJS914 wrote:Better in which way? It just depends on your goals.
My guess is that on Campagnolo Boras (c17) most people are using a 25mm tire. I mean a tire that actually measures 25mm when installed. For example a 23mm Grand Prix 4000S measures out to 25mm. Some people probably use the next size up if it fits in their frame and they probably don't care about the few watts used up by a wider tire.
Whether you buy a 17mm internal rim or a 19mm internal rim is not going to make a huge difference. I have two wheelsets, one is 15mm internal and the other 19mm internal. I run the 23mm Grand Prixs on both (again, they measure around 25mm on the 15mm rim and 26mm on the wider rim). Both work fine. I get a little bit more volume on the 19mm internal rims. The difference is not earthshattering.
Like I said, start with the tires you want to run and work backwards.
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ultimobici
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They may be under review, but overly narrow tyres on a wide rim are generally a bad idea unless your riding is on billiard smooth roads. The wider the rim, the more prone to pinch flats one will be.
Most tyres come up big rather than small. Veloflex is the only brand I can think of that seems to go the other way. The fact is that many race tyres currently on the market were designed with a particular internal width range in mind that didn’t take the trend to go wider into account because 17c rims were for touring. So while you can fit them to whatever rims you want, whether they actually perform properly is another matter. Just because a customer wants something doesn’t mean they should be given it.
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Most tyres come up big rather than small. Veloflex is the only brand I can think of that seems to go the other way. The fact is that many race tyres currently on the market were designed with a particular internal width range in mind that didn’t take the trend to go wider into account because 17c rims were for touring. So while you can fit them to whatever rims you want, whether they actually perform properly is another matter. Just because a customer wants something doesn’t mean they should be given it.
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We have multiple wheelsets that meet this spec.
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bm0p700f
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Ultombici I did give the specific example of the conti gp 4000s 23mm tyre. Not every 23mm tyre works on a wide rim I did say that but some do. Although I would not use the conti in anything wider than a 19mm internal width rim.
Since the bead distance if every 23, 25 and 28mm tyre is different the ertro chart really does not inform. If ertro standardised tyre width then there chart becomes useful again.
Since the bead distance if every 23, 25 and 28mm tyre is different the ertro chart really does not inform. If ertro standardised tyre width then there chart becomes useful again.
DT Swiss has an "updated" version of the ETRTO that I think it is quite realistic. In my opinion, 19c internal is the most versatile width for my interest, from 25 to 32c tires. I am not sure I would feel comfortable using a 23c tire on that internal width. I know that HED says that 23c tires are ok on rims wider than 20c internal but I wouldn't risk it.
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bm0p700f
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Talk to a wheelbuilder.
Here's one just for starters
The wheels in my look 785.
45mm deep, 18.5mm internal width weight 1280g.
It's so simple.
Another alloy set. Easton R90SL rim 24F/28r can be built sub 1400g with CX rays. you have to stop looking at off the shelf.
As I have said since there is no standard 23mm tyre e.t c charts like this make little sense. If they published bead to bead distance it would make more sense.
Here's one just for starters
The wheels in my look 785.
45mm deep, 18.5mm internal width weight 1280g.
It's so simple.
Another alloy set. Easton R90SL rim 24F/28r can be built sub 1400g with CX rays. you have to stop looking at off the shelf.
As I have said since there is no standard 23mm tyre e.t c charts like this make little sense. If they published bead to bead distance it would make more sense.
If weight is your concern, ride tubulars. There ain‘t nothing like it. I ride Campagnolo Bora Ultra 35 (1160g) and Bora Ultra 50 (1215g). Hardly ever have flats, and I riding on less than perfect roads. The quality of the wheels can’t be beat, either. And no worries about internal rim width 
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