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Old 02-13-12, 08:59 AM   #1
jkemp9
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27" tire/wheel fit question and axle swap advice needed

To anyone who knows the answer to this I'm sure it is very obvious and I've searched but can't figure out how to manipulate the search to find the answer. Really just looking for a yes or no- I'm looking at putting Club Roost 27 x 1 3/8 tires on my Bianchi Piaggio commuter/joy rider which has 27 x 1 1/4 wheels. It seems like a 700 x 28 vs 700 x 32 situation but I wanted to check with you all. Since it's dealing with 27", I thought I'd ask here.

I would really rather swap axles to a set of 700c's that are much lighter and would vastly increase my tire choices. Or, put a different threaded axle through my 700 set so I don't have to take apart my 27's just in case, or as a backup set. OR, ideally would like to get the right size quick release to work, if there is such a thing. I don't really want to do any grinding to get the quick release to fit. I know a 700 is a little bit smaller, found that out when I tried forcing a wire bead 700 on my 27" wheel... It looks like there is about 1/2" at most to drop the pads down the caliper arms.
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Old 02-13-12, 09:06 AM   #2
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So the 27" set has nutted axles and the 700c set has quick releases?
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Old 02-13-12, 09:13 AM   #3
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Quote:
Originally Posted by miamijim View Post
So the 27" set has nutted axles and the 700c set has quick releases?
Correct
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Old 02-13-12, 09:22 AM   #4
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Issues I see are tire clearance issues, axle width issues, derailleur and freewheel compatibility issues. I swapped a pair of 700 wheels/tires into my Schwinn LeTour replacing the old 27s, indeed, the rims are about 4mm smaller, so brakes had to adjust. Axle width was also a bit wider, so the frame had to spring a bit to get it in, no problem. Same number of gears? Indexed or friction? May or may not work, depending on just what you have and what you get. My old, 1979 Shimano 400 FF has NO problem jumping from 5 to 7 gears (friction shifting) but I did need to get a new chain.
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Old 02-13-12, 11:00 AM   #5
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I'm confused. What happens when you try to install the 700 wheel? Is it too wide to fit in the frame? If so, that's a spacing issue, not a q/r issue.
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Old 02-13-12, 02:33 PM   #6
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due ruote- The axle diameter on the 700 c qr is too wide to fit into the front fork. AKA the part of the fork that the axle fits into (pictured below) is too narrow for the quick release axle. I don't know the measurements but it seems really close. I think if I were to get the dremel tool out it could be done, but I'd rather not do any grinding.



The axle length is also a little long for the front and the fork would flex to fit, but should it? I'm a heavier rider and don't want to do anything to affect the integrity of the fork. I roughly measured the rear axles and they appear to be very close to the same size. I don't have the 700c wheel with me now...

There is a whole lot of clearance. To be technical, I can fit at a finger between the side wall and the fork/seat stay and two above the front and rear tire.

It is set up SS. I would probably take it to LBS to verify sizes and fit for another freewheel on my 700c freehub.

I'm clearly not a professional bike mechanic and have only casually been working on bikes for a couple years, and that's mostly been on newer aluminum bikes, so I really appreciate your help and patience.
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Old 02-13-12, 06:07 PM   #7
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http://sheldonbrown.com/frame-spacing.html

It's surprising to me that your axle won't fit in the fork. If it's really close I'd probably file/grind to make it fit. You could file the threads on the axle instead of the fork, although I wonder if maybe the paint is just thick there. As far as the fork width goes, 100mm is pretty standard as you can see on the above chart. Is your axle spacing close to that? You won't hurt anything if you spread the fork a little bit, but it shouldn't need to be much at all.
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Old 02-14-12, 10:30 AM   #8
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I work out of town and won't be back around the 700c wheelset for at least 2 weeks. So I'm not sure what the spacing is but I was able to pretty easily spread the forks to fit outside the locknut and on top of the axle. I ordered up some club roost cross terra's for now. I was planning to grind the threads if anything on the 700c axle. Thanks for the help.
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Old 02-14-12, 12:00 PM   #9
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There's too much paint/powder coat in the fork ends....file it out or scrap it out with a knife. Most modern 700c front wheels are 100mm spacing.
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Old 09-10-13, 10:07 AM   #10
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Sorry to jump on here its just my question relates somewhat to this one. I purchased 27" wheels for my 73 bianchi. I found nice looking black set with the deeper v look and it was not easy. They came with QR and the spacing on back wheel was much to wide. 130c. I removed the axle and now need a shorter one. QR is preferred but not necessary. Does anyone know what length? and do I need to worry about thread measurement? Hear is the link for anyone who needs 27" wheels to dress up vintage bike.http://www.ebay.com/itm/281122855943...84.m1439.l2649
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Old 09-10-13, 10:22 AM   #11
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For a 1973 Bianchi, the spacing is almost certainly 120mm (measure the rear dropouts across the verify). Normal 6/7 speed spacing is 126mm. Modern cassette hubs are 130mm.

1) Not sure why you want to go to 27" wheels (instead of 700c, which is far more common these days) Were the original wheels 27" or 700c?
2) Since it is a steel frame, the rear triangle can be spread. Normally on 126mm spaced frames, it is no big deal to put a 130mm hub in (2mm per side). Many people cold set the frame to 130mm though (or have a shop do it). On a 120mm frame, trying to cram a 130mm spaced wheel in might not work so well.
3) 1970s Bianchis aren't so common, so unless it is an entry-level frame, doing things such as this to it might not be the best thing. It is your bike however.

These wheels might be a better choice... http://www.velomine.com/index.php?ma...oducts_id=1570

EDIT: post pics of the bike, including drive side shots, and we may be able to provide more help

Last edited by Pars; 09-10-13 at 10:27 AM.
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Old 09-10-13, 03:00 PM   #12
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i've found that front forks are easy to spread a few millimeters by hand and foot. go slow and remeasure often.
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Old 09-16-13, 06:53 AM   #13
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So I too out the spacer and added one from another wheel. It was shorter. I cut the axle and it as about 1/5 to long. so I just spread the rear when adding wheel and it perfect. QR was to long so I used a shorter one a had on hand and bang its perfect. I did not want to stretch my frame and I'm told the brakes don't reach and can be a pain to find right ones. This was by far the quickest way. Just not a lot of options. Ended up with quando wheels and panaracer tires. Looks sweet. I will post pic,s
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