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  1. #1
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    2018 Race King and Cross King Widths

    Does anybody have measurements for the recently revised Race King or Cross King? I liked the old versions of each, but they were a bit undersized.

  2. #2
    Formerly of Kent
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    Quote Originally Posted by fatcamper View Post
    Does anybody have measurements for the recently revised Race King or Cross King? I liked the old versions of each, but they were a bit undersized.
    The 2.2 RK was in no way undersized. If anything, it was larger than specified.

    The X-King 2.4 was a 2.2 though. I’ll give you that.


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  3. #3
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    That seems fair. I ran the old RK on a narrow rim, and it seemed narrow and tall. The 2.2 XK paired with it seemed much skinnier. I never measured either.

  4. #4
    Mudhorse
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    Bear with me, fatcamper, I'm about to replace a 2017 Race King ProTection with the new 2018 Race King ProTection, and I shall measure them both up for you. It's hard to tell from photos, but comparing the 2017 and 2018 RKs side-by-side it looks as though the knobs on the new model are just a tiny bit smaller (in terms of knob area; hard to tell if there's a height difference). Same pattern and knob count though.
    Hose me down till the water runs clear.

  5. #5
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    Quote Originally Posted by Grassington View Post
    Bear with me, fatcamper, I'm about to replace a 2017 Race King ProTection with the new 2018 Race King ProTection, and I shall measure them both up for you. It's hard to tell from photos, but comparing the 2017 and 2018 RKs side-by-side it looks as though the knobs on the new model are just a tiny bit smaller (in terms of knob area; hard to tell if there's a height difference). Same pattern and knob count though.
    Grassington, Please measure the knob width edge to edge between the 2017 and 2018. I'm hoping you are mounting it on the same rim so we can get a true apples to apples comparison. Thanks so much.

  6. #6
    Mudhorse
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    Just look at the fantastic service you get on this forum! I've measured the carcass width of three tyres:

    2017 Race King ProTection. Fitted in August 2017 and run for a couple of hundred hours at 33 psi.
    2018 Race King ProTection. Fitted today, never inflated before.
    2017 X King RaceSport. Fitted in August 2017 and run for a couple of hundred hours at 25 psi. While I was in measurement mode I was curious to see how a RaceSport carcass stacked up against the beefier ProTection in terms of expansion under pressure. The results are quite surprising.

    All tyres are a nominal 2.2" and mounted on Race Face ARC i27 27.5" rims. Measurements taken with Mitotoyu digital calipers (in calibration) and measured at the same point on the tyre to eliminate width inconsistencies. Measurements are sidewall-to-sidewall only as the outer knobs on these tyres don't protrude further than this. Pressures taken with a Meiser Accu-Gage, so while consistent they could be a couple of psi off from the true pressure.

    In an unholy mix of units:
    2018 Race King and Cross King Widths-conti-tyre-widths-vs-pressure-mm-.jpg

    In Church of England units:
    2018 Race King and Cross King Widths-conti-tyre-widths-vs-pressure-inches-.jpg

    I also measured the 2017/2018 Race King knobs. Knob height seems to be unchanged (~2.2 mm centre/~2.8 mm outer) but the knob footprint seems to have shrunk between 2017 and 2018: centre knobs were about 10.3 mm across the widest point, now they're about 9.2 mm.

    In the unlikely event that I remember/have spare time/can be arsed, I'll measure the 2018 Race King again once it's got a few miles on it as there's a good chance it'll stretch once it's broken in. If I get a 2018 Cross King I'll measure that too, but that could be a fair while away, unless I have some sort of disaster with the current 2017 X King (from experience there's a good chance this may happen).
    Hose me down till the water runs clear.

  7. #7
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    Thanks Grassington! I'm a bit disappointed as I was hoping the 2018 RaceKing would be at least as large at the 2017 version.

  8. #8
    Mudhorse
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    Quote Originally Posted by Stonerider View Post
    Thanks Grassington! I'm a bit disappointed as I was hoping the 2018 RaceKing would be at least as large at the 2017 version.
    Bear in mind the 2018 RK I measured is brand new and will probably stretch out a bit once it's got a few miles on it. Even when new it's just over its specified 2.2" at a measly 20 psi. I was surprised at how narrow the 2017 X King was though, as that's had as many miles on it as the 2017 RK and I doubt it's got any more stretching to do.

    The Race Kings are fitted to the rear, run at 33 psi and take most of my 200 lb loading. The X King is on the front, run at 25 psi, and mostly has a relatively easy life except for abuse under hard braking and endo turns.
    Hose me down till the water runs clear.

  9. #9
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    I have the new Race King 2018 2.2 Protection mounted on my i30 wheels. I can measure them and get back with the results.
    I am considering getting the new Cross King 2.2 or 2.3 since the 2.4's was my go to everything tire and the Race Kings are a but slippery on the hard surfaces.

  10. #10
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    I have been using Race King 2.2 Protection 2018 tires front and rear fro two weeks now. I managed to measure them before I had a puncture on the rear tire.
    With 1bar or 14.5psi my tires are 57mm wide.
    I will go to the new Cross King Protection 2.2 tires instead, same weight but more grip. The Race Kings are too slippy for me even on dry terrain.

  11. #11
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    I have mounted new Cross King 2.3 Protection tires on the same i30 wide rims.
    I will return with width data after a fem rides.
    They seem "higher" than the Race Kings, ie the wheels have a larger circumference and I don't think I can go much larger on my Trek Top Fuel.

  12. #12
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    I'm on 26" Race King RaceSport 2.2" front and rear, Syntace W35 rims (28.4 mm inner width). The tires measured 56.1 mm wide when first installed; after 340-ish km they are 57.0 mm. Measurements taken at 20-23 psi pressures. Center knobs measure 9.7-9.8 mm; I'm not sure whether the tires are 2017 or 2018.

    Thinking to get an X-King RaceSport 2.4" (2017) or a Cross King for the front because RK lacks sideways traction too much. Have to choose between 2.2" and 2.3" CK versions, and I wonder how they compare in width to RK 2.2".
    26" rigid SS 4130 BB7 nylon-flats ESI latex-tubes non-lubricated-8spd

  13. #13
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    I have just switched from 2.2 RK to 2.3 CK protection.
    I have also got the 2.2CK ready to be mounted. The 2.2 and 2.3CK seems to be very different. The 2.3 is much sturdier, the knobs are longer etc. The CK 2.3 is 1.4mm wider than the 2.2 RK at 2bar.
    Looking at the 2.2CK in their package I would say its thinner than the 2.2RK.
    Tire Bar Width mm
    Race King 2018 2.2 Protection 1 58
    2 59
    Race King 2018 2.2 Racesport 1 57
    2 58
    Crossking 2,3 prot 1 59,6
    2 60,4

  14. #14
    meow, meow.
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    Thank you!!

    The 2.3" being so much different from 2.2" explains the ~100 g weight difference, I guess.
    26" rigid SS 4130 BB7 nylon-flats ESI latex-tubes non-lubricated-8spd

  15. #15
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    A diagram of the widths

    2018 Race King and Cross King Widths-tirewitdh.jpg
    RK = Raceking
    CK = Cross King
    Prot = Protection version
    Race = Racesport version

  16. #16
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    For those of you with 2018 Race Kings, what's your experience with their durability?
    Last edited by midwestmtb; 06-22-2018 at 02:16 PM.

  17. #17
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    I misread at first. I have been using the Race King 2.2 Protection and I got a hole in the sidewall after two weeks of use which I deemed non repairable. I was riding very low pressure on the rear wheel (0.5bar) which might have caused it.
    The 2.3 seems fine but they are quite heavy. I am now running the 2.2 and will return when I get som mileage on them.
    Last edited by kave; 06-23-2018 at 11:57 PM.

  18. #18
    MCMXCV
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    Quote Originally Posted by kave View Post
    Click image for larger version. 

Name:	tirewitdh.jpg 
Views:	147 
Size:	22.5 KB 
ID:	1204101
    RK = Raceking
    CK = Cross King
    Prot = Protection version
    Race = Racesport version
    Thanks for this.... How is the 2.3 CrossKing holding its air/sealant? Any sealant weeping from the sidewalls?

  19. #19
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    Both 2.3 and 2.2 Crosskings and my 2.2 Race kings are protection so they leak absolutely nothing. I tried one 2.2 Race King Racesport and that leaked in the beginning.

  20. #20
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    Wrong thread.....

  21. #21
    meow, meow.
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    Quote Originally Posted by kave View Post
    The 2.3 seems fine but they are quite heavy. I am now running the 2.2 and will return when I get som mileage on them.
    Are you settled on the 2.2 RK Protection/2.2 CK Protection combo? Is 2.2 CK indeed narrower than 2.2 RK?

    (I've got a XK 2.4" RaceSport on the front right now. It measured about 1 mm wider than 2.2" RK RaceSport when both were new. Weight is 552 g (26"). Traction is adequate compared to RK. But I'm on the verge of going tubeless because latex tubes seem to be pushed over their limit by the combination of asymmetric, wide rims, low pressures, and RK being fatter than the typical 2.2" tire.)


    Edit: Update on XK 2.4" RS. It's now worn in a bit and is 2 mm wider by carcass than RK 2.2" RS (59.0 vs 57.1 mm). At the same time, it's ~1.5 mm lower, by carcass, than the RK: 54 mm vs 55 mm height from edge of rim to ends of center knobs, and 2.6 mm vs 2.0 mm center knob height.
    Last edited by J. Random Psycho; 07-16-2018 at 04:10 AM.
    26" rigid SS 4130 BB7 nylon-flats ESI latex-tubes non-lubricated-8spd

  22. #22
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    I posted in another thread but I measured new 2018 Race King protection 29x2.2 on 23mm rims as 52mm @20psi new. I pumped them to 50psi and let them sit for a week. They were 56mm @50psi and then 54 @ 20psi. I think they might be close to 55mm now.

  23. #23
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    Really disappointed customer here! Used to ride the old RK 2.2 both front and rear. Yesterday I got some X king to try it in front, changed it the next two hours! XK 2.2 is way smaller than 2.2 RK(old), that means you got way too much vibration that goes directly to your hands. RK absorbs way too much and this is why was my favorites. About cornering, ok the x king maybe is grippier although i loose it once on hard braking, but from 2 hours ride I can't say for sure! So after XK failed to convince me I changed again to RK but this time the new one. Andddd magic!! The new RK is also smaller than the old RKs 🤦
    I changed again to my old one and now I'm looking to another brand with big volume tires! Any suggestion btw? I have in mind to try some bontragers, WTB and maybe Aspens 2.25?

  24. #24
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    XR team Bontys are high volume. You should have wide rims to get the most out of them. Like 30mm inner for 2.2.
    https://www.trekbikes.com/us/en_US/e...-tire/p/11866/

  25. #25
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    Quote Originally Posted by cycloholic View Post
    XK 2.2 is way smaller than 2.2 RK(old)
    Yes, that's the gotcha with the XK. Try a 2.4" if you can get it; it's about the same inner cross section area as RK 2.2" but closer to an ellipse in shape.

    Quote Originally Posted by cycloholic View Post
    The new RK is also smaller than the old RKs
    Which versions are you comparing? See kave's chart above: 2018 RK 2.2" RaceSport are about as fat as 2017 according to it, and the Protection is still fatter. I've added my RK data to this database: Reifenbreite Continental Race King 26x2,20
    26" rigid SS 4130 BB7 nylon-flats ESI latex-tubes non-lubricated-8spd

  26. #26
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    Both 2.2 protection! You can see the difference to the naked eye, not even you have to measure 🤔

  27. #27
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    Race King 26x2.2 Racesport.
    Installed yesterday on 26mm internal rim, 50 PSI: 2.2"
    24 hours later: 2.22"

    I assume it will gain another mm in the next week.

    I would say true to size.

  28. #28
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    I went from RK RaceSport 2.2" 2018/XK RaceSport 2.4" 2017, latex tubes to RK/CK Protection 2.2" 2018, tubeless, on my geared bike. Here are some observations:

    1. In 2018, RK and CK tires labeled 2.2" are a close match by actual size.
    2. Protection versions hold air no worse than latex tubes even without sealant (at least while they aren't worn)!
    3. I had to further reduce pressure in both Protection tires to maintain same ride quality on dirt as compared to RaceSport/latex tubes. Running about 19-21 psi now, used to run 21-23.


    So far, both are great tires! And the RaceSport RKs are seeing use on my beefy SS as Maxxis Ikons wear out.
    26" rigid SS 4130 BB7 nylon-flats ESI latex-tubes non-lubricated-8spd

  29. #29
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    Quote Originally Posted by CrozCountry View Post
    Race King 26x2.2 Racesport.
    Installed yesterday on 26mm internal rim, 50 PSI: 2.2"
    24 hours later: 2.22"

    I assume it will gain another mm in the next week.

    I would say true to size.
    A month later 2.25"-2.26" on 50 PSI.

  30. #30
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    Quote Originally Posted by midwestmtb View Post
    For those of you with 2018 Race Kings, what's your experience with their durability?
    2018 RK is comparable to the old version. I've currently got a 2.2" Race Sport on the back of my old 26er Anthem training bike and have done a couple of thousand km's offroad on it since Feb. There's noticeable wear of course, but it's perfectly fine to stay on for a while yet.


    The difference in bag size between the old and new versions is significant. The new version is discernibly less plush, although I wouldn't say harsh. I preferred the big bag of old for floating over messy terrain. On the upside, the side walls on the new version don't protrude and are therefore less likely to get cut. It still rolls like a billiard ball.


    Can't say I notice the difference resulting from slight change in knob shape/size. Was good. Is good.

  31. #31
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    Just mounted up two Race King 29x2.2 Protection from Jenson.

    After mounting:
    Front: 2.11" ≈30psi Arch EX (21mm IW) 632g
    Rear: 2.12" ≈30psi Arch EX (21mm IW) 610g

    Now for comparisons sake I have a probably 5yo Race King Performance 29x2.2 that is super worn out and has rolled at least 6k miles:

    2.15" (mounted on a Syncros rim that was OEM on my alu 2013 Scale)

    So will check back a week or so later to see if the new ones stretch any.


    Also interesting to know the casing (knob area) wasn't round like the old ones. Was more pointy in the middle since the transition area knobs were reduced.

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