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Old 01-14-14, 04:44 PM   #1
seedsbelize 
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27"vs 700C

Hi All,
I'm getting ready to build a dynamo hub into a wheel. Initially I was going to use a frame that was made for 27", and then, along the way, found a better one, designed for 700c. I have a plethora of 27"rims at the ready. can anybody see any reason to not continue with the 27". the brakes on all of my current fleet have the needed 4mm adjustment available.
As always, thanks in advance.
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Old 01-14-14, 05:03 PM   #2
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.. just that tire selection is more limited choices .. tend to be pragmatic rather than performance.
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Old 01-14-14, 05:21 PM   #3
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Good point. If I hadn't already bought the spokes.... It's for an all arounder that I'm building, so I'm limited in that regard anyway.
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Old 01-14-14, 06:06 PM   #4
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If using a dynamo hub, I assume this is a touring, commuter or utility bike. Then you may want to make sure it leave adequate fender clearance.
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Old 01-14-14, 06:13 PM   #5
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Another good point. Thanks.
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Old 01-14-14, 06:17 PM   #6
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It may be possible to select 700C rims that allow one more crossing with the spokes you bought.
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Old 01-14-14, 06:32 PM   #7
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If this is a racing style bike you can easily run into tire clearance issues because the smallest commonly available 27" tire is 1 1/8" wide, or about 28.6mm. Combine this with a 4mm greater rim radius and you can see how a lot of bikes that came with 700c wheels will not fit 27" wheels. But if you have adequate room, go for it.

OTOH there is no downside to using 700c rims on a bike that came with 27" rims except for the brake reach.
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Old 01-14-14, 07:37 PM   #8
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generally speaking, i prefer 27 (630mm) rimmed wheels. but, unfortunately, they are a thing of the past. i've got two older (79 and 85) trek frames designed for 27" wheels, but i've found that i can mix and match pretty much at will as far as using 700c (622mm) rimmed wheels.
i keep an eye out on Ebay for NOS 27x1 or 27x7/8 27" inch tires and buy them if the price is right.

AFAIK there is only one 27x1 tire that is widely available. that is is Panaracer one. haven't used it yet, but there may come a time when i can't find anything else.

a person has to be of a certain mindset (and... ahem, age) to deal with the hassles of buying 27" NOS tires.

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Old 01-14-14, 07:37 PM   #9
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BTW- if you're shopping in Merida you might actually find 27" tires more available than 700c.
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Old 01-14-14, 07:57 PM   #10
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I run a set of 27" on my vintage tourer and find that with the 27", 1-1/4" gator hardshells I have on it offer a huge contact patch, puncture protection, smooth and fast rolling with the room to clear planet bike 45mm fenders. Also the 27" rims are typically wider then your standard 700c so the wider tires will fit better and not balloon at the sidewalls. For comparison I run 700x25-28 gatorskins on all my other bikes.
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Old 01-14-14, 08:41 PM   #11
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generally speaking, i prefer 27 (630mm) rimmed wheels. but, unfortunately, they are a thing of the past.
What's your reason for this? I prefer 700c due to tire choice/availability, and the ease of swapping a 700c wheelset with a tubular set.

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I run a set of 27" on my vintage tourer and find that with the 27", 1-1/4" gator hardshells I have on it offer a huge contact patch, puncture protection, smooth and fast rolling with the room to clear planet bike 45mm fenders. Also the 27" rims are typically wider then your standard 700c so the wider tires will fit better and not balloon at the sidewalls. For comparison I run 700x25-28 gatorskins on all my other bikes.
FWIW there is a trend these days in road biking to move to wider rims. Regardless, you can already get a 700c rim in pretty much any width you want. I like the idea of wider rims but I can't seem to tell any difference when I'm riding. So because of that and the fact that narrow rims are almost always lighter I generally go with the narrow rim. Right now I'm running a 1.95" MTB tire on the front of my commuter on a 19mm wide (outside width) Velocity Fusion rim and it works just fine.
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Old 01-14-14, 08:53 PM   #12
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BTW- if you're shopping in Merida you might actually find 27" tires more available than 700c.
They're available, but the quality is so poor that I don't use them. Practically ALL of the tires here are of poor quality, and so I bring them all in from the outside. Practically. I can buy Michelins in 26 and 700c, but they don't hold up. I'm of the belief that it's because of the harsh weather conditions. And they're cheap tires. No demand for better ones.
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Old 01-14-14, 08:55 PM   #13
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Of my two road bikes the largest tire that will fit on one is a 700x23c (Michelin), the other a 700x25c. No way could I even think about a 27".
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Old 01-14-14, 09:51 PM   #14
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FWIW there is a trend these days in road biking to move to wider rims. Regardless, you can already get a 700c rim in pretty much any width you want. I like the idea of wider rims but I can't seem to tell any difference when I'm riding. So because of that and the fact that narrow rims are almost always lighter I generally go with the narrow rim. Right now I'm running a 1.95" MTB tire on the front of my commuter on a 19mm wide (outside width) Velocity Fusion rim and it works just fine.
I'm aware of the availability of wider 700c rims, I was referring to the OP who said he has a "plethora" of 27" rims, and was just stating that the 27" rims mostly come in wider widths so the limited available 1-1/8 and up tires will fit better.
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Old 01-15-14, 11:13 AM   #15
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If you already have a bunch of 27" rims, I see no current reason to move to 700c. I have a number of older bikes with 27" wheels and, while it's true that choice is more limited, tires are still being manufactured in this size. If the supply runs out in the future, you could rebuild then.
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