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  1. #1
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    Switching from 27 inch to 700c

    Hello all

    I just recently bought a used Nishiki road bike and didn't realize that the back wheel was a 27 inch and the front was a 26 inch, so I've decided to change both to 700c wheels. The bike has a 5 speed cassette and the spacing between the frame for the back wheel is about 120mm. I was wondering if I could buy a 700c wheel (campagnolo) with an 8 speed cassette and replaced the hub and cassette with the ones in the rear wheel of my bike (the 27 inch) so that the 700c wheels would fit.
    Thanks ahead of time.

    andy

  2. #2
    Bianchi Goddess Bianchigirll's Avatar
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    Hi Andy. there is alot going on there. first of all why does the bike have a 27" RW and 26" FrntW? should both wheels be 27"

    when changing from a 27" wheel to 700c wheel the first thing you need to consider is will the brake pads contact the smaller diameter rim?

    in theroy yes you can put the 8spd Campi wheel in the frame but you would have to use a friction shifting system unless you intend to change the shifters and rear derailleur. which could become expensive.

    is this a frankenbike, a women's geomentry, or TT/Funny bike? pics?

    PS there are dozens of post both here and on the C&V forum about changing from 27" to 700c wheels
    Last edited by Bianchigirll; 12-16-09 at 04:13 PM. Reason: add text
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

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  3. #3
    Senior Member Road Fan's Avatar
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    If 27 inch is the OEM size for both wheels, by far the easiest thing to do is to buy a complete 27 inch front wheel from, say Niagara, for well under $100.

  4. #4
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    Yes both wheels should be 27, I'm not sure what the previous owner was thinking.

    The break pads will reach for sure, there's a lot of room for adjustment going down and my bike has friction shifters. It's an old Nishiki

    Im scared that the wheel will not fit in the frame because the frame only has room for a 5 speed cassette. Can I just use the hub and casettes off the old wheel and use them in place of the 8 speed hub/cassette? Will that make it small enough for a 120mm wide drop out?

    Thanks.
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  5. #5
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    While relacing a wheel is not as tough as some think, the fact is spokes are expensive. You will need 2 different lengths and the cheap ones are sold in boxes of fifty or by the gross. I have seen certain sizes of stainless steel spokes on sale for $12 for 18 spokes but not regularly and only in a few lengths.

    You can buy a 700c wheel in 120mm, I believe. Niagaracycle.com or bikepartsusa.com have them, unless you're doing this to get an aero rim. The 120mm 700c's look like "old tenspeed wheels". They'll say 5/6 speed because of the ultranarrow suntour ultra-6 freewheel. Should be about $25/wheel.

    You can easily respace a steel frame to take a 130mm road wheel and at least some old derailleurs seem to be able to handle all 8-10 speeds of a modern cassette, but you would then need to buy a cassette and chain, and a 10spd chain may not fit your front rings. I mean for a 10sp cassette. They are much narrower. Your bike is currently equipped with a freewheel, not a cassette and there'd be no place for it on the new wheel. See sheldonbrown.com for instructions on spreading a frame.

    You could just buy a 27" front wheel. Or a 27" or 700C wheelset from ebay.

    They make great touring, training and cyclocross tires in 27", some as modern as any comparable 700C (but not racing tires), as well as old school, low end tires with no flat protection.

    What's wrong with the old wheel?
    Last edited by garage sale GT; 12-16-09 at 05:05 PM.

  6. #6
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    Is the fork a 27" or 26"? If a 26" I doubt if it will accept a 700 wheel. Test to see if a 27" or 700 mm wheel will fit.

    Al

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    The hub is the part of the wheel that determines which rear spacing you need. 120mm for a 5 speed, 126mm for a 6/7 speed, and 130 for 8, 9 or 10 speeds.

    So, yes, you can use the hub you have with the rim on the Campy 8s speed wheel. Or you could just buy a new 700c rim and have that laced to the 5 speed hub. Or you could spread the rear of the bike to fit the Campy 8 speed hub.

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    You'll save a lot by going with shimano 8/9/10 700c's unless you know of where you can get a campy wheel for a good price. You can get store brand cassettes at online retailers for $20 in any size you are likely to need.

    All three of the sources I mentioned can provide a 27" fork but you will need to paint it. I think you have a road fork though because of the chrome tips.

    Do an online fit calculator (maybe prop the front wheel on something 15mm tall before measuring the bike) before you sink all kinds of money into it. What with working bikes going for $25-50 on cl, you don't want to ride an uncomfortable bike. It really makes a huge difference.

    Also, a fact which soured me to road bikes till I figured it out, the seat has to comfortably span your sit bones.
    Last edited by garage sale GT; 12-16-09 at 05:50 PM.

  9. #9
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    This is the campy wheel i was planning to buy and do the hub switch: http://cgi.ebay.com/Campagnolo-Omega...item1c0ea8d1fa

    So just to double check and settle my paranoia... switching the hub in the above campy wheels with the hub in the original wheel will make the campy fit inside my 120mm frame with the original 5 speed cassette. Correct? If not, I'll just stick a 27 inch from one of the sites you showed me into the front wheel instead.

    I've ridden the bike, it fits my sit bones well and is a joy to ride...even with the mismatching wheels and malfunctioning brakes

    And the frame is a 27, the back wheel has a 27 inch right now.

    Thanks a bunch!

  10. #10
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    On second thought, widening the rear triangle makes much more sense than replacing the hub. Widening it from 120 to 130 shouldn't be too damaging on the frame right?

  11. #11
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    "never glued" means it's a tubular wheelset.

    The Campy cassette may cost a bundle to replace when you need to.

    The existing spokes may not be the right length for your hub, if you decide to relace the rear rim into your hub.

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    You glue the tires to the rim. They start at $25 apiece and go up, and the lower end ones don't offer flat protection. You have to buy at least three because they need to be replaced when flat. Some say the sealants for them work, others don't like them. If you puncture one you can repair it at home but it is supposedly complicated.

    They will probabaly have somewhat fragile sidewalls which are not too resistant to abrasion, but some standard racing and touring tires are the same.

    They're supposed to have a great ride for such narrow, low rolling resistance tires. Some people love them. They're essentially racing tires.

    There's no using standard tires on a tubular rim.

    Sheldonbrown.com has a wealth of info on them, and there should be searchable threads here too.

    I bet that price is going to go up though.

  13. #13
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    I'll just purchase a 27 inch wheel for the front then. Seems like the most cost efficient way to go.

    Thanks for the help!

  14. #14
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    OK, I hate to be a bother, but I see a lot of old road bikes with shot rear hubs. Lift the rear of the bike, grab the rim, and see if it wobbles from side to side on the axle. If so, it needs a new axle, cones, and bearing balls and it is possible the hub is also shot.

    The rim and spokes are somewhat flexible but if the cones are shot or the axle's bent, you'll feel a slight sense of it clunking around on the axle. In other words, it will be ever so slightly loose on the axle.

    If you ride it that way you can expect the looseness to rapidly deteriorate. It can break and the friction will go up.

  15. #15
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    Quote Originally Posted by garage sale GT View Post
    OK, I hate to be a bother, but I see a lot of old road bikes with shot rear hubs. Lift the rear of the bike, grab the rim, and see if it wobbles from side to side on the axle. If so, it needs a new axle, cones, and bearing balls and it is possible the hub is also shot.
    .
    Wobblling on the axle could mean a number of things, doesn't automatically mean it needs a new axle, cones or bearings.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  16. #16
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    Quote Originally Posted by operator View Post
    Wobblling on the axle could mean a number of things, doesn't automatically mean it needs a new axle, cones or bearings.
    Please elaborate.

  17. #17
    Bianchi Goddess Bianchigirll's Avatar
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    I am begining he needs to walk this bike to the local shop and get a professional assment of what it really needs after he clean it a bit.
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

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  18. #18
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    I think ruined cones and a bent axle are very likely if the hub is a little loose on the axle.

    Also, if someone misadjusted good cones, leaving them loose, the misadjustment itself would cause the cones to crap out unless it wasn't ridden or was ridden by a very light person for a short time.

    You could just ride it. It probabaly won't crap out catastrophically. You could decide if you like the bike before getting a new wheel.

    Why am I diagnosing it sight unseen? The majority of vintage bikes I have seen have this condition. Maybe because my ideal frame size is a few cm larger than yours though. This old school tech is a bit less strong than newer bikes and has to be ridden with care over bumps.
    Last edited by garage sale GT; 12-17-09 at 08:43 AM.

  19. #19
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    Quote Originally Posted by garage sale GT View Post
    I think ruined cones and a bent axle are very likely if the hub is a little loose on the axle.

    Also, if someone misadjusted good cones, leaving them loose, the misadjustment itself would cause the cones to crap out unless it wasn't ridden or was ridden by a very light person for a short time.

    You could just ride it. It probabaly won't crap out catastrophically. You could decide if you like the bike before getting a new wheel.

    Why am I diagnosing it sight unseen? The majority of vintage bikes I have seen have this condition. Maybe because my ideal frame size is a few cm larger than yours though. This old school tech is a bit less strong than newer bikes and has to be ridden with care over bumps.
    100% wrong

    Play in the hub means exactly that. Play. It could be a loose cone adjustment. Your routine experience with crap wheels has biased you. Even a wheel with a bent axle will have a tight/loose spot unless is just utterly destroyed in there. Even if the cones are pitted, they'd have to be extremely pitted to affect the final hub adjustment in an overhaul. It is not an ideal situation but telling the OP that it's extremely likely he'll have to replace nearly all his parts on a hub based one *one* symptom is just bad advice and at best ignorant.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  20. #20
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    Quote Originally Posted by operator View Post
    100% wrong

    Play in the hub means exactly that. Play. It could be a loose cone adjustment. Your routine experience with crap wheels has biased you. Even a wheel with a bent axle will have a tight/loose spot unless is just utterly destroyed in there. Even if the cones are pitted, they'd have to be extremely pitted to affect the final hub adjustment in an overhaul. It is not an ideal situation but telling the OP that it's extremely likely he'll have to replace nearly all his parts on a hub based one *one* symptom is just bad advice and at best ignorant.
    Ok, since you weren't listening, operator, a loose cone adjustment can produce pitted cones because it greatly accelerates wear. If you don't know that, then you shouldn't be calling other people ignorant.

    Whether the cones are loose because the axle bent, or because someone like you assembled or serviced the bike and left them loose, it doesn't bode well for the cones.

    How about that, everyone. The guy doesn't know you gotta take the play out of a cup and cone ball bearing to keep it from wearing out, and he goes around calling other people ignorant.
    Last edited by garage sale GT; 12-17-09 at 01:08 PM.

  21. #21
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    Maybe I shouldn't wade in, but I don't think anyone would agree that a strong correlation between play at the rim and bearing wear automatically implies the need for a new axle, cones and bearings. I've certainly had plenty of dump finds which have not needed an axle transplant.

    To the OP: the easiest thing to do is to figure out what the bike originally had and stick with that. Failing that, spreading the rear triangle is really easy.

  22. #22
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    Quote Originally Posted by tellyho View Post
    I don't think anyone would agree that a strong correlation between play at the rim and bearing wear automatically implies the need for a new axle, cones and bearings. I've certainly had plenty of dump finds which have not needed an axle transplant.
    Maybe, but only because many bikes are used so little before being tossed out. They say 75 miles from store to landfill is the average amount of use for low end bikes.

    If the OP is planning to use the bike a lot it should be adjusted at a minimum.

    I had a brand new, fixed rear wheel which loosened up during its first cruise. It was ok but I had gone less than 15 mi before catching it and walking home.

    The kluge fix of the front wheel suggests maybe someone needed the bike on a regular basis and kept it rolling any way they could, which doesn't bode well for the "loose adjustment, no axle needed" theory b/c the bike may have been used regularly.

    Of course, it would probabaly keep going for quite a bit with pitting cones and crappy adjustment, at the cost of extra drag and the risk of a snapped axle.

    Incidentally, every freewheel bike I have ever had which had a rear wheel with play, inevitably also had a bent axle and pitted cones. However, I buy bikes sized for medium or larger guys.

  23. #23
    Senior Member canopus's Avatar
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    Quote Originally Posted by garage sale GT View Post
    Ok, since you weren't listening, operator, a loose cone adjustment can produce pitted cones because it greatly accelerates wear. If you don't know that, then you shouldn't be calling other people ignorant.
    Your right it can but that doesn't mean it did and that is the point operator meant which you failed to explain. You wouldn't know what a misadjusted hub did to the races and and hub until you get into it, sometimes they are fine and all you have to do is to adjust them, other times they might be destroyed, don't just assume they are bad.

    Quote Originally Posted by garage sale GT View Post
    Whether the cones are loose because the axle bent, or because someone like you assembled or serviced the bike and left them loose, it doesn't bode well for the cones.
    Axles and cones can take a lot of punishment before going bad. Perfect no, but on these bikes and these types of axles and cones they can take a lot.

    Quote Originally Posted by garage sale GT View Post
    How about that, everyone. The guy doesn't know you gotta take the play out of a cup and cone ball bearing to keep it from wearing out, and he goes around calling other people ignorant.
    He does know, his people skills are lacking but he does know.

  24. #24
    Senior Member canopus's Avatar
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    To the OP, do not get the tubular rims. An 8 speed changeover would require more parts than I think you need to tackle right now.
    Especially in a frame spaced at 120mm. Replace the front wheel with a 27", probably from a dumpster find would be just fine. Later on after some riding and some more knowledge then you can decide whether or not you want to respace the frame and replace the drive train or find a new bike.

  25. #25
    Senior Member peripatetic's Avatar
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    Why doesn't the OP actually just take apart the rear hub to assess what, if any, problem there is with it? Even if the cone is a little pitted, it's useable with new bearings and good grease. If you have to replace the cone, however, it's probably not worth the hassle unless you can find such a replacement very easily. Vintage cone replacement can be way more headache than it's worth and/or impossible to actually accomplish. Replacing either/both wheels w/ 27" wheels will probably be cheaper than 700c--look on your local Craigslist before Ebay.

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