4" tire on 100mm rim?- Mtbr.com
Results 1 to 14 of 14
  1. #1
    mtbr member
    Reputation:
    Join Date
    Nov 2015
    Posts
    4

    4" tire on 100mm rim?

    Just recently purchased a 2016 Salsa Blackborow. I've been on a few rides on groomed trails and can already tell the 5" tires are going to be a little over kill in the summer months. Can I put a 4" tire on a 100mm rim or am I looking at purchasing a new wheels set for the summer? My fat bike is my only mountain bike and would like to get the most out of it all year. Thanks!

  2. #2
    Hooligan
    Reputation: dirtdawg21892's Avatar
    Join Date
    Jul 2009
    Posts
    964
    You can, but the profile will be fairly low and it may pinch flat easier.
    Ive run a larry 3.8 on a 100mm rim for a long time with no issues.
    Quote Originally Posted by Optimus View Post
    Hell of a jump, dawg. Even though they're baggy shorts, I'm surprised that you can fit your balls into them.

  3. #3
    mtbr member
    Reputation:
    Join Date
    Aug 2014
    Posts
    217
    You'll probably end up with selfsteer. Better get a 29+ or 27+ wheelset...

  4. #4
    Hooligan
    Reputation: dirtdawg21892's Avatar
    Join Date
    Jul 2009
    Posts
    964
    Quote Originally Posted by new8812 View Post
    You'll probably end up with selfsteer. Better get a 29+ or 27+ wheelset...
    Depends on the tire and pressures used. The Larry doesn't, but some of the cheaper vee's do.
    Quote Originally Posted by Optimus View Post
    Hell of a jump, dawg. Even though they're baggy shorts, I'm surprised that you can fit your balls into them.

  5. #5
    mtbr member
    Reputation: bighit's Avatar
    Join Date
    Feb 2004
    Posts
    2,512
    larry used to be the stock tire for Surly on the Moonlander. I have been wondering what smaller lighter tires would work for some summer rides.
    2013 mongoose Fat bike
    2012 Moonlander.

    http://undergroundvelo.proboards.com/

  6. #6
    aka bOb
    Reputation: bdundee's Avatar
    Join Date
    Feb 2008
    Posts
    8,678
    Actually a BFL is a good summer tire for 100mm rims.

  7. #7
    turtles make me hot
    Reputation: NYrr496's Avatar
    Join Date
    Sep 2008
    Posts
    10,411
    So is the 4.8 Knard. Works great on Clownshoes.
    I like turtles

  8. #8
    mtbr member
    Reputation: watts888's Avatar
    Join Date
    Oct 2012
    Posts
    6,279
    I'd try the 5" tires at a little higher pressure. I like the feel of the 4" tires on the 80mm and 50mm rims more. I've run 4" tires on 100mm rims, and it works. Unfortunately, I've got some scrapes on my rims to show it.
    "a hundred travel books isn't worth one real trip"

  9. #9
    mtbr member
    Reputation:
    Join Date
    Aug 2007
    Posts
    1,010
    As mentioned above 4" tires on 100 mm rims are really 'low', think pimped cars!

    This might be ok if you want float at low weight for winter, but in summer it would suck. You would have pinchflats/rim strikes like crazy and the cross section profile would be very flat/squared off, leading to poor handling on hardpack.

    I tried it when 4" Dillingers were the lay studded option, and it lasted 2 miles before I pinchflatted and dented my rim.

    I would suggest a nice fat, fast rolling, lightweight tire like the Jumbo Jim 4.8, Knard 4.8 or BFL.
    Of course that will be heavy, so you might want to switch to a lighter, narrower wheelset

  10. #10
    mtbr member
    Reputation:
    Join Date
    Mar 2004
    Posts
    141
    I rode 4.7 Big Fat Larry's all summer on 100mm Clownshoes and I didn't find it overkill at all. Rolled pretty fast and smooth. I was able to keep up with all the regular 2" wheeled bikes no problem.

  11. #11
    I'm how far behind?
    Reputation: Soloracer's Avatar
    Join Date
    Jan 2004
    Posts
    571
    Works as long as you don't mind the constant rim strikes.
    Fatter than most.

  12. #12
    mtbr member
    Reputation: Steve Balogh's Avatar
    Join Date
    Feb 2008
    Posts
    806
    Back when only the Endomorph and Nokian 3.0 Gazza's were the only tires available, I remember some people using 100MM rims. Don't recall pinch flats being an issue, but steering on off camber trails wasn't pleasant. Similarly, I had used Nokian Freddie Revenz 2.3 tires on 65MM Large Marge rims. I bought a 47MM trails rim to use on the front so I could steer better. If you do go ahead with your idea, I'd recommend only using a 100 only in the back and use a normal width rim up front for a 4" tire.

    The other thing that is bad about this idea is lowering your BB height. Smacking things with the pedals during a ride was never pleasant. Best done on flat terrain, otherwise on trails as said above, rim strikes, bad steer, low BB just doesn't work well with trail riding.

  13. #13
    Not the fake Jay Leno
    Reputation: Chinman's Avatar
    Join Date
    Dec 2014
    Posts
    367
    I will pile on to what others have said. I put some 4" FBN's on my 90 mm Fatboy rims last summer. Pinch flat, pedal strike city. I put the GCs back on. They did roll great though, and I would have no problem using them for non-tech stuff, or commuting.

  14. #14
    mtbr member
    Reputation:
    Join Date
    May 2011
    Posts
    1,961
    Quote Originally Posted by jtholmes25 View Post
    ... Can I put a 4" tire on a 100mm rim or am I looking at purchasing a new wheels set for the summer?...
    Riding where, what kind of trails, in what kind of conditions?
    Crazy on this ship of fools...

Similar Threads

  1. Replies: 3
    Last Post: 03-18-2015, 08:06 PM
  2. Fat Tandems Builders accommodating 100mm rim w/ 4.8" tire
    By ds2199 in forum Tandem Mountain Bikes
    Replies: 54
    Last Post: 02-19-2015, 12:41 PM
  3. 26x3.5" tire on 100mm rim?
    By AdamJay in forum Fat bikes
    Replies: 10
    Last Post: 03-21-2014, 07:25 PM
  4. Got 100mm 29" HT what next 100mm 120mm or 140mm FS?
    By cloudbuster in forum General Discussion
    Replies: 0
    Last Post: 08-24-2013, 04:23 AM

Members who have read this thread: 3

Posting Permissions

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

THE SITE

ABOUT MTBR

VISIT US AT

© Copyright 2019 VerticalScope Inc. All rights reserved.