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Comfort 14mm rim vs. 18mm rim

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Comfort 14mm rim vs. 18mm rim

Old 09-24-14, 02:50 PM
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Comfort 14mm rim vs. 18mm rim

Comfort wise how would a 18mm rim with 23s compare with a 14mm rim with 25s? I had 14mm rims with 23s on them and switched to 25s for comfort reasons. I just purchased a set of 18mm wheels and am a little nervous with how little clearance I have between the frame and tire. I am considering going back to the 23s on the new wheels if the comfort is close to the same.
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Old 09-24-14, 03:00 PM
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Return the 18mm wheels, get some 23mm or 25mm wide wheels, run 25 mm tires at ~10-20% lower pressure than you were running on 18 mm rims.
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Old 09-24-14, 03:02 PM
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A lot of varibles there. But, sure, the 23c on a 18mm (internal width?) rim might feel as comfy as a 25c on 14mm. I was always a touch nervous running Mich. Pro Race 3 (PR3) 25's on some Mavics (huge 'lightbulb' look to the profile as the tires run large). I'm now running much wider Pacenti rims; even with PR3 23's (not the 25c because of limited clearance) they feel a bit better to me. As Elvo mentions, the comfort of the wider rim is mostly in the lower PSI's that they 'allow'.
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Old 09-24-14, 03:20 PM
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Originally Posted by Elvo
Return the 18mm wheels, get some 23mm or 25mm wide wheels, run 25 mm tires at ~10-20% lower pressure than you were running on 18 mm rims.
He means internal width, not external.
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Old 09-24-14, 03:46 PM
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Originally Posted by Elvo
Return the 18mm wheels, get some 23mm or 25mm wide wheels, run 25 mm tires at ~10-20% lower pressure than you were running on 18 mm rims.
I like this idea but there is no way I would have enough clearance. I have borderline clearance right now with the 18mm(inside width) rim with the 25s. As long as my wheel stays perfectly true I am fine. But, if I hit a pothole or break a spoke I am concerned even with a spoke wrench I will not be able to true it enough on the side of the road to keep it from rubbing on the frame.
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Old 09-25-14, 03:38 AM
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Originally Posted by hazben1
I like this idea but there is no way I would have enough clearance. I have borderline clearance right now with the 18mm(inside width) rim with the 25s. As long as my wheel stays perfectly true I am fine. But, if I hit a pothole or break a spoke I am concerned even with a spoke wrench I will not be able to true it enough on the side of the road to keep it from rubbing on the frame.
You really need to clarify for us whether you are talking inside or outside width. There are two different conversations going on here. 13 or 14 mm inside rims are 19 or 20 mm outside. 18 or 19 mm inside rims are 23-25 mm outside. The replies are at cross purposes.
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Old 09-25-14, 05:31 AM
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Yes, so an 18mm internal width (IW!) rim might be a 23 or 24 mm outer width (OW) rim. This wider rim will likely create a slightly larger tire than if the tire were mounted on the narrower rim. Also, keep in mind that some tire models run narrow, some run wide... tires have a reputation that google can help you research. For example, a 23mm Maxxis Zephyr on a 23mm OW rim has been measured at 25mm.

From a safety point of view, the 23mm tire on your 18mm IW rim may also be a bit narrow (see red and green chart under "width considerations" here: Tire Sizing Systems).

Best thing might be to install and measure and try out the 23mm tire on the 18mm IW rim. The tire may measure close to 25mm width, depending on the brand of tire. OTOH, the tire may be narrower than the rim (which seems a bad idea).
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Old 09-25-14, 06:00 AM
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Toss the show room bicycle that has problems with wide tyres, sell 2nd hand and get a proper bicycle that has room for 28mm tyres at least.
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Old 09-25-14, 06:31 AM
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Originally Posted by Slaninar
Toss the show room bicycle that has problems with wide tyres, sell 2nd hand and get a proper bicycle that has room for 28mm tyres at least.
You're not following what is going on here. The 18 mm internal width rim with 25 mm tire that OP has been using results in a tire width approximately 28 mm wide. So his frame is fine.
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Old 09-25-14, 01:43 PM
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Originally Posted by rpenmanparker
You really need to clarify for us whether you are talking inside or outside width. There are two different conversations going on here. 13 or 14 mm inside rims are 19 or 20 mm outside. 18 or 19 mm inside rims are 23-25 mm outside. The replies are at cross purposes.
You make a good point I went ahead and measured the inside width of the two rims. The 14mm measured exactly 14mm. The other rim which was sold as 18mm inside width was actually closer to 16mm. I guess I will go ahead and just try an old 23 on the rim and see how it feels. The tires I plan on running on these wheels are GP4000s which I am told are a little wider than advertised.
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Old 09-25-14, 01:50 PM
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Originally Posted by hazben1
You make a good point I went ahead and measured the inside width of the two rims. The 14mm measured exactly 14mm. The other rim which was sold as 18mm inside width was actually closer to 16mm. I guess I will go ahead and just try an old 23 on the rim and see how it feels. The tires I plan on running on these wheels are GP4000s which I am told are a little wider than advertised.
It depends on what you're measuring and what the measurement was measuring.

Could easily be the 18mm rim was measured interior sidewall to interior sidewall...whereas you were measuring bead-to-bead
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Old 09-25-14, 02:41 PM
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Correct I am measuring bead to bead. I guess that is where the difference comes in.
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