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  1. #1
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    Min. tire width for 27mmx559mm Sun Rhyno Lite rims

    I have self-made "hybrid" bike that uses 27mmx559mm (i.e., 26") Sun Rhyno Lite rims with 26"x1.75" Continental Top Touring 2000 tires. These tires are awesome but have worn away after about 10 years (5k miles) service.

    All my riding these days are pavement/road with the bike below (used for grocery, errands mostly). I don't weigh that much but my rear panniers can accumulate up to 40lbs (gentle riding over mostly smooth pavement or road).

    Using the SAME rims, what's the min. tire width I can get away with?

    (Replacement tire will most likely be 1.5" or 1.6" Kenda or Geax. But a 1.25" width appeals to be for fast speed. FWIW, this chart (also shown below) suggests 1.5" to be the min. "recommended" width for 27mm wide rims.)

    Thx for any feedback you can provide!!

    The bike used (Gary Fisher 21.5" frame mountain converted to "hybrid":


    Chart from bikesdirect.com:
    Last edited by hollowman; 02-15-14 at 09:33 PM.

  2. #2
    Stealing Spokes since 82' Fizzaly's Avatar
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    I've ran 1.5" with my sun estate rims before with no problems I believe they're 33mm wide, granted it wasn't easy getting the tires on them. I don't suggest the 1.25 tires, if you wanna go that narrow you're better off switching to a 700c wheel, just get a high pressure 1.5".

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    i think the OP has the minimum inside width mixed up with the outside width. rhyno lite rim dimensions, i think , are: inside = 20.7 outside width 27.5. the chart above refers to the inside width. if so the OP shouldn't have any trouble with a 1.25 tire. IME, i've never seen a MTB rim that wouldn't except a 1.25 or wider tire. not that i would be surprised or disappointed if somebody posted a few pics of some just to prove me wrong. (i know i wouldn't hesitate for a second.)

    here's the specs that i found:

    Rim ID 181
    Manufacturer Sun
    Model Rhyno Lite
    Descriptor (pinned)
    Tire Size ISO 559 (26" mtn)
    ERD 548.8 mm 0
    Offset drilling 0 L, 0 R
    Outer width 27.5 mm
    Inner width 20.7 mm
    Overall height 15.5 mm v
    Brake wall height 12.6 mm v
    TireType clincher v
    JointType Pinned v
    Eyelet type Single v
    Weight 550 g v
    URL
    Last edited by hueyhoolihan; 02-15-14 at 10:22 PM.

  4. #4
    Stealing Spokes since 82' Fizzaly's Avatar
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    No mixup just giving my two cents on 1.25" 26er tires, I've had better luck with 1.5" for ride quality. I was just pointing out that I've fit 1.5" tires on an even wider rim so 1.25" should work on yours if that's the route you wanna go. A high pressure 1.5" should yield you the high rolling speed with low resistance you want, and still be good and stable whole loaded.

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    Rim label says 27mm

    Thx for the chart. Not sure it's the correct one for MY Sun rims.

    The print on the stuck-on label on the Sun rims says "6000 Series alloy 559x27mm". I assume the default metric printed is the std. SINGLE width reported for rims: inside width.
    I don't have calipers handy at the moment. But I can report back later...
    Meanwhile, Sun's site says "width" Rhyno Lite is 27.5mm
    I got 'em from HarrisCyclery (Sheldon Brown) in 2004. This is the product page.

    Quote Originally Posted by hueyhoolihan View Post
    i think the OP has the minimum inside width mixed up with the outside width. rhyno lite rim dimensions, i think , are: inside = 20.7 outside width 27.5. the chart above refers to the inside width. if so the OP shouldn't have any trouble with a 1.25 tire. IME, i've never seen a MTB rim that wouldn't except a 1.25 or wider tire. not that i would be surprised or disappointed if somebody posted a few pics of some just to prove me wrong. (i know i wouldn't hesitate for a second.)

    here's the specs that i found:

    Rim ID 181
    Manufacturer Sun
    Model Rhyno Lite
    Descriptor (pinned)
    Tire Size ISO 559 (26" mtn)
    ERD 548.8 mm 0
    Offset drilling 0 L, 0 R
    Outer width 27.5 mm
    Inner width 20.7 mm
    Overall height 15.5 mm v
    Brake wall height 12.6 mm v
    TireType clincher v
    JointType Pinned v
    Eyelet type Single v
    Weight 550 g v
    URL
    Last edited by hollowman; 02-15-14 at 11:35 PM.

  6. #6
    Senior Member Bill Kapaun's Avatar
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    Rhino Lite 22.0mm inside 27.4mm outside.
    Rhino Lite XL add 1.5mm to both dimensions.

    1.25" tire should be OK although a bit on the skinny side.

    http://sun-ringle.com/wp-content/upl...files_rev_.pdf
    Last edited by Bill Kapaun; 02-16-14 at 07:35 AM.

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    Senior Member Medic Zero's Avatar
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    I've successfully run Conti Gatorskins in 1 and 1/8th inch on Rinolytes. It was a harsh ride and they were a real bear to get on and off, but they fit.
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    Is high pressure important?

    What about pressure?

    Many suggest "high" pressure. Not sure what's high for my application. The Geax Street Runner 26 x 1.6" model has a suggested range of 45-75psi, but the 1.25" can go as high as 100psi.

    Also, for high pressure, should one opt for a certain type of inner tube? E.g., one more robust as the inner diameter (one that mates with rim and valve-stem hole) experiences more "stress" at higher press.

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    Tire Rim Width Recommendations Chart

    I think Bill Kapaun is right. I found the same ID of the rim. According to this chart, which is just bit conservative from what I have read, you are on the narrow side. I'm willing to bet if we overlayed the Bikes Direct chart with this one, we would have a match.

    Rim Tire Width Compatibility Chart.jpg
    Last edited by RoadTire; 02-16-14 at 08:52 AM.
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  10. #10
    Senior Member gregjones's Avatar
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    As with most other things. Advice is advice and YMMV.

    I took one of my Craigs List flipper bikes to make something for Cheryl. I took off 50X559 knobbie MTB tires and put on 40X559 road tires--smooth with "rider comfort grooves". On a nothingoutoftheordinary Big Box MTB wheel the 40mm tire fit and they worked great.

    But, on this particular tire/wheel combo I played hell getting the bead to seat evenly around the rim. I had to partially inflate the tire and bounce it around until everything popped into place.

    The sizes for rim vs. wheel fit perfectly into any chart you'd care to use. This combo just happened to be a stinker.
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  11. #11
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Quote Originally Posted by hollowman View Post
    The print on the stuck-on label on the Sun rims says "6000 Series alloy 559x27mm".
    I have a set of these. I put some 1.3" tires on them once. I'll never do that again. Actually measured the wheel to make sure it hadn't been labeled the wrong size. I tried mounting 1.5",but didn't like the way the beads looked. They seated,and held max pressure,but the distance between the mold lines near the bead and the rim varied. I decided not to risk it,and mounted some 1.75" tires instead. No issues with those.

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    Quote Originally Posted by hollowman View Post
    Thx for the chart. Not sure it's the correct one for MY Sun rims.

    The print on the stuck-on label on the Sun rims says "6000 Series alloy 559x27mm". I assume the default metric printed is the std. SINGLE width reported for rims: inside width.
    I don't have calipers handy at the moment. But I can report back later...
    I measured with calipers. 27.5mm outside width. Not sure about inside.

    As far as the replacement tire ... Geax Street Runner Tire 26x1.6" seems like a decent choice ...

  13. #13
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    Quote Originally Posted by Bill Kapaun View Post
    Rhino Lite 22.0mm inside 27.4mm outside.
    Rhino Lite XL add 1.5mm to both dimensions.
    1.25" tire should be OK although a bit on the skinny side..
    Quote Originally Posted by dynaryder View Post
    I have a set of these ["6000 Series alloy 559x27mm".]. I put some 1.3" tires on them once. I'll never do that again. .
    I'll let this one brew a bit ...

  14. #14
    Quirky Grifter LesterOfPuppets's Avatar
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    I've run Michelin Wild Run'r 1.4" on 25mm rims. I'd probably run 'em on 27.5mm rims, too.
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  15. #15
    Senior Member Bill Kapaun's Avatar
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    Quote Originally Posted by hollowman View Post
    I measured with calipers. 27.5mm outside width. Not sure about inside.

    As far as the replacement tire ... Geax Street Runner Tire 26x1.6" seems like a decent choice ...

    I use those in 1.25" on my grocery getter and like them enough that I bought an extra set when they were on sale.

  16. #16
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    as to PSI:

    i run about 80 PSI on my 20mm-25mm 700c tires. 75 on my 28mm 700c, about 70 on my 28mm 650c and 65 on my 1.25 MTB tires. my weight is about 150 and run Mr. Tuffy tire liners.

    if i would get too many (not an ISO standard, BTW ) pinch flats i would increase the PSI... as it is i don't get too many. or any really.

  17. #17
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    When manuf's or spec sheets only list ONE rim width (i.e., inner or outer is not specified), I thought the default was inner.

    However, the confusion in this thread (as well as what we've gleaned from various manuf. sites and spec sheet, etc., as we've dug up in this thread) seems to suggest that there is no convention.

    What gives?!!!

  18. #18
    Senior Member Bill Kapaun's Avatar
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    Welcome to bicycles!

  19. #19
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    Quote Originally Posted by hollowman View Post
    However, the confusion in this thread ...


    We like it that way.
    "Of course you eat too much" (Looigi) There are things people say that are so true you can never forget the wisdom. I still eat too much. Without denial.
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  20. #20
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Quote Originally Posted by hollowman View Post
    I'll let this one brew a bit ...
    Note that he said "should be";he was guessing. I did it.

    148999369_1b2a926ea0_o.jpg

    After the fun I had mounting them,I decided there was no way I'd want to deal with a flat at the side of the road. Mounting the 1.75's was easy,used a lever for the last bit of bead and that was it.

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  21. #21
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    Quote Originally Posted by dynaryder View Post
    Note that he said "should be";he was guessing. I did it.

    148999369_1b2a926ea0_o.jpg

    .
    Pffffft!
    With those tan tirez on there ... flats are the least of your worries .... Man that is one UGLY PIECE OF KIT

  22. #22
    Senior Member Medic Zero's Avatar
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    Quote Originally Posted by dynaryder View Post
    Note that he said "should be";he was guessing. I did it.

    148999369_1b2a926ea0_o.jpg

    After the fun I had mounting them,I decided there was no way I'd want to deal with a flat at the side of the road. Mounting the 1.75's was easy,used a lever for the last bit of bead and that was it.
    The first time I had a flat with my 1 & 1/8th inch wide Gatorskins, I spent a good 20 minutes on the side of the road trying to wrestle the tire off, and this was on a warm sunny day! You can go that narrow, but it has it's problems. The reason I got a flat was because I hopped off a curb. The tiny tire wasn't up to that and I ended up with a snakebite flat, even though it was at proper pressure (116 PSI).
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