Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Newbie
    Join Date
    Sep 2011
    Posts
    1
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Tire/wheel Size Question

    Hi all

    First time here go easy on me,

    I have a Trek FX 7.1 with 700C tires
    read 700x35 on the tire

    I want to replace the entire tire and wheel with one that is labeled 700x28C for the sake of adding a electric hub motor to it,
    I am just wondering if this will new tire/wheel will fit? as I no nothing of what these numbers mean, any insight would be more appreciated

  2. #2
    Senior Member
    Join Date
    Jan 2011
    Location
    South Yorkshire, England.
    My Bikes
    Colnago CX-1 Record 11sp. Carbon Epic expert 29er, Claud Butler Dalesman. Proflex X-px Works, Cougar 653. KHS Montana Pro, Hercules Alassio. Ammoco Monte Carlo F/SS. Corratec Superbow Fun 29er. Claud Butler Midas. Kenisis T2. Peugeot Perthus.
    Posts
    245
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hello namesake.

    The 35 and 28 refer to the tyre's width (i think it's millimeters), so the 28 is slightly narrower than the 35 and may give a slightly less comfortable ride because of it. Also, as you are going slightly narrower you don't need to worry about having enough clearance in the frame, a problem which may present it's self if you were going wider. The 700 refers to the size of the wheel, If you stick with a 700 wheel you should have no problems with fitting.
    Colnago CX-1 Record 11sp. Carbon Epic Expert 29er

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,817
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    As noted, the "700" refers to the rim diameter which is actually 622 mm across the bead seats. The 35 and 28 refer to the tire width, also in mm, so a 700x28 tire has a beadseat diameter of 622 mm and is 28 mm wide when installed. If you look on the tire side wall you should see the numbers 622-28 or 28-622. Any tire labeled 622 will fit your rims unless it is extremely narrow or extremely wide. Neither 28 nor 35 are a problem and you could exchange the 28 mm tires on your new wheel with the 35 mm tires on your old wheel if you wish.

  4. #4
    Advisor
    Join Date
    Mar 2008
    Location
    Central New Jersey
    Posts
    544
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The only problem you may encounter is you may have to readjust the brake pads. The width of the wheel is probably a little different. As stated, you can always go narrower as you are planning to do but you may encounter brake clearance and frame problems going wider. You won't encounter this problem.

  5. #5
    Junior Member Blutarsky's Avatar
    Join Date
    Sep 2011
    Location
    50,000ft & > mach
    My Bikes
    Cannondale CAD3
    Posts
    19
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Okay - I came up with this on a search and I have a, well, similar question. Hopefully similar enough not to be considered a hijack. My tires are labeled with the logo and 23-571, and have an additional stamp elsewhere on the tire that says 26x1. I haven't seen any in the places I've been looking that are anything other than "700." Are my tires *that* much smaller than every other 56cm bike on the planet?

  6. #6
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,817
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Blutarsky View Post
    Okay - I came up with this on a search and I have a, well, similar question. Hopefully similar enough not to be considered a hijack. My tires are labeled with the logo and 23-571, and have an additional stamp elsewhere on the tire that says 26x1. I haven't seen any in the places I've been looking that are anything other than "700." Are my tires *that* much smaller than every other 56cm bike on the planet?
    Your rims and tires are not 700C but what is commonly known a 650C (ISO 571) and were sometimes used on small frame bikes to keep the rider's toes away from the front wheel on tight turns and on triathlon and time trial bikes as they were a bit more aero. 650C tires are available but not nearly as common as 700C so you will have to look around.

    BTW, the most common 26" size these days is the mountain bike ISO 559 and there are several other "26 inch" size rims and tires, none of which are interchangeable with your 650C or each other, so be very careful what you buy.

  7. #7
    Senior Member
    Join Date
    Sep 2008
    Posts
    4,280
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jeremy1981 View Post
    Hi all

    First time here go easy on me,

    I have a Trek FX 7.1 with 700C tires
    read 700x35 on the tire

    I want to replace the entire tire and wheel with one that is labeled 700x28C for the sake of adding a electric hub motor to it,
    Respectfully, that doesn't make sense. If you have an electric hub wheel the size of the rim will dictate the possible tires that can fit on it. My gut feeling is that an electric hub wheel will be on the wide side and putting a narrow tire woudn't be recommended. If the rim could take a 28mm tire I wouldn't do it unless you were very light as the added weight and wear would benefit from a wider tire and most likely one that is fairly puncture resistant, ie. heavy. So whatever benefit you're seeking from a narrower tire will be complicated by the greater wear and harsher ride. Are you sure your electric wheel can take a 28mm tire and why are you going for that size of tire?

  8. #8
    Junior Member Blutarsky's Avatar
    Join Date
    Sep 2011
    Location
    50,000ft & > mach
    My Bikes
    Cannondale CAD3
    Posts
    19
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks a ton for the info, and confirms my gut feeling. Frankly, the wheels/tires just flat out look small. What I can't figure out is that it's a 56cm bike, it that considered "small?" We'll see how broken Japanese works at the LBS finding tires... ;-)

  9. #9
    Senior Member
    Join Date
    Feb 2001
    Location
    England
    Posts
    12,353
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Back to the OP, your electric hub will have a different 700c rim to the original one. It will be the same diameter but the width may vary a bit. Rims have a range of suitable tyre width.
    Is there any advantage in replacing your 35mm with 28mm?
    28mm is a fairly sporty size for hybrid bikes and good for longer commutes. Electric bikes are heavier and less able to be bunny-hopped over obstacles, potholes and rough stuff. Most electric bikes come with fatter tyres to absorb this impact.
    You can re-use your existing tyre and inner tube and replace it with another size when it wears out.

  10. #10
    DRF aka Thrifty Bill wrk101's Avatar
    Join Date
    Jan 2008
    Location
    The NC Mountains
    My Bikes
    Too many to list, all vintage
    Posts
    19,572
    Mentioned
    68 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by Blutarsky View Post
    Thanks a ton for the info, and confirms my gut feeling. Frankly, the wheels/tires just flat out look small. What I can't figure out is that it's a 56cm bike, it that considered "small?" We'll see how broken Japanese works at the LBS finding tires... ;-)
    Its not the size of the bike that determines the wheel size, it is the design of the bike. I have a 56cm frame bike that has 650c wheels, and that was how it came from the factory. It is a triathlon bike.

    I would consider a 56cm frame size to be "medium".

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •