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Old 11-12-08, 03:08 PM   #1
JustCruisin
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Wheels- 27 inch or conv. 700

I am doing a my first build ,a Puch Mixte. It currently has 27" wheels that I will replace as they are pitted bad enough I can't seem to polish them out. I am also converting it to a single speed and plan to keep it for my familys use. Now the question?

1. Will the weinmann brakes on the bike reach the 700 wheel braking areas without changing calipers.

2. Which takes the wider tire, is it a more comfortable ride because of this.

3. Any significant advantages of either other than the great selection of colors etc on the 700.

4. Your general coments on your preferences ( take into consideration this bike is not being built as a
racer or road bike but 0ne that we can use on the local trails in our area and a run to the coffee shop.)
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Old 11-12-08, 05:36 PM   #2
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Originally Posted by JustCruisin View Post
I am doing a my first build ,a Puch Mixte. It currently has 27" wheels that I will replace as they are pitted bad enough I can't seem to polish them out. I am also converting it to a single speed and plan to keep it for my familys use. Now the question?

1. Will the weinmann brakes on the bike reach the 700 wheel braking areas without changing calipers.

2. Which takes the wider tire, is it a more comfortable ride because of this.

3. Any significant advantages of either other than the great selection of colors etc on the 700.

4. Your general coments on your preferences ( take into consideration this bike is not being built as a
racer or road bike but 0ne that we can use on the local trails in our area and a run to the coffee shop.)
1. One measurement is worth 1,000 guesses. If you don't own a 700c bike, find somebody who will lend you a pair of 700c wheels to trial fit.

2. It's probably going to be a wash. The frame space near the bottom bracket or the amount of space between the brake pads are usually the factors that determine how wide of a tire you can fit.

3. 27" tires are still easily get-able. 700c tires are available in much more variety.

4. I'm a believer in keepint the wheel size stock. You don't have to work out the potential brake reach issues and the bike is less likely to look goofy when you are finished.
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Old 11-12-08, 06:42 PM   #3
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Retro's right, but I'm going to differ on a couple of small points. My singlespeed is built from a Trek touring bike that came with 27-inch wheels, and when I swapped to 700c's (for a larger selection of tires, and because I had the wheels lying around), it was a straight bolt-on. All I had to do was lower the brake pads in the calipers' slots. Not all brakes have that much adjustment, though.
FWIW, rim width isn't usually the limiting factor in tire width. I've run tires from 23 to 41mm on the same wheels on a couple of bikes with no trouble. The space between the fork blades and under the rear brake arch are more likely to restrict you, and the slightly smaller-diameter wheels will give you more space there. My Trek would fit 1-1/4 inch tires with the 27s, but with the 700s, the 41mm tires have lots of room.
You CAN still get 27-inch tires, but the variety is pretty limited, and most shops that stock them have low-end tires for older, rarely ridden bikes. With 700c, you can get anything you want, from fatty knobbies to skinny time trial rubber.
Functionally I don't think there's any difference. You could invent theoretical benefits (the larger wheel rolls over obstacles better?), but they're so close it doesn't matter. My pref if I could swap without buying new brakes would be for 700s, for the range of tires. If I had to spend money on brakes, I'd stick with the 27s and never give it another thought.
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Old 11-12-08, 08:14 PM   #4
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27" to 700c you need to be able to move the pads outboard. 700c is 27.55 in inches, so you need to move the pads roughly 1/4" outboard from where they are now.

Hope that helps. Just did it on a co-workers retro Raleigh. I like the 700c idea because they're current and you can get rims/parts/tires/tubes anywhere

-R
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Old 11-13-08, 10:52 AM   #5
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If the brake pads almost reach but are less than a mm away you can take a round rat tail file to the slots in the Weinmann brakes to get them there.

How big a selection of tires do we need? The 27 1 1/4" is the type of tire he's looking for for his type of riding. If he were thinking of making it a century rider with expensive Grand Bois tires than he would have to go to 700c.

If you want fenders, (and you should) and there is not enough space (although I bet there is) than going to 700c would give you a little more room.
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Old 11-13-08, 12:31 PM   #6
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Originally Posted by CCrew View Post
27" to 700c you need to be able to move the pads outboard. 700c is 27.55 in inches, so you need to move the pads roughly 1/4" outboard from where they are now.

Hope that helps. Just did it on a co-workers retro Raleigh. I like the 700c idea because they're current and you can get rims/parts/tires/tubes anywhere

-R
The difference between 700 and 27" is only 4mm in radius (630-622=8, 8/2=4). I have never had a 27" bike that wouldn't take 700 wheels, as long as it had the original brake calipers. I'm still using one 27" wheel, but when it needs to be replaced it will be with a 700, unless I find a really cheap 27".

em
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Old 11-17-08, 08:59 AM   #7
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Thanks all for the comments. I found a set of wienmann wheels in Wisconson (27") at a pretty fair price and had new tires 1 1/4 put on along with an 18 tooth freewheel at a fair price. I already had the splash guards on order Vs full size fenders, just like the look and we really dont ride wet if we can help it. Again thanks for your time.
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