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tim.bikeparty

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Reply with quote  #1 
Hey folks, i recently purchased an Ibis Hakkalugi to be a more speed-oriented gravel/cx bike to compliment my BMC monster cross. IMG_9046.JPG 

i am looking for some good gravel tires that are 37-38mm wide.  i have 35's that just don't give me the cushion i want and the frame max's out at about 40mm

IMG_9048.JPG 

I've been looking at either the Challenge Gravel Grinder 38s, Maxxis Rambler 38s, or WTB Riddler 37s.  Can anyone confirm the actual width of these?  i've seen tires run 2, 3, even 5mm off of their claimed diameter, and I'd hate to drop $100+ on a set of tires only to have them not fit or just be 35's with a napoleon complex.

My rims are about 19mm internal width.

Are there any others i'm missing that are in that width? (regardless of claimed size)

Thanks!

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moe53

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Reply with quote  #2 
I've been using the Challenge GG's 120 tpi race version for a few years. True 38's, 35/38 psi. with latex tubes.  Very good tires, tough, supple.
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knl2stl

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Reply with quote  #3 
I run Challange 38 120 tpi with tubes on 18.1mm internal rims at 40-45 psi.  They are at best 36.5mm wide on my rims.  Before these tires I ran Clement MSO 40 120 tpi with tubes and they measured out to 40mm.  Before the MSOs I ran a 35mm tire that measured out to 35mm.  

I am a little disappointed that the Challenge GG are this narrow; however, even though they have a rather firm flat protection belt in them they have a really supple casing.  At 36mm they provide a smoother ride than the MSOs did at 40mm.  There have been a couple of times when I would have traded the suppleness for more width.  
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tim.bikeparty

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Reply with quote  #4 
good info.

i've heard the Clement MSO 36's actually run more like 37-38.  should i consider them as well?

i'm not trying to nickel n dime a mm or two, i just want to make sure i'm not considering options that won't work for my frame or will just be a duplicate of tires i already own.
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shoota

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Reply with quote  #5 
Almost every review I've seen of the Rambler 40mm say they are more like 38s. That's what I would pick for your fast bike. 
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knl2stl

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Reply with quote  #6 
There is a thread in this forum somewhere about people having quality issues with the tubeless MSOs and the 120 40c MSOs.  I had to return three out of three 120 40c MSOs due to issues.  
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bobknh

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Reply with quote  #7 
My $.02: You can't depend on any "real" tire measurements, because the actual width of the tire on your wheel depends on the width and shape of your rim, tire pressure. Your best bet may be to aim a bit smaller in the nominal width of your tires. I'm personally, a big fan of tires manufactured by the Japanese company Panaracer - both under their own label, Gravel King, and under the Compass label. My personal favorites are the 35 mm Bon Jon's, and the 38mm Gravel King SK. GK's are "tubeless ready", while the Bon Jon's are "tubeless compatible. I've been running both tires on separate HED Ardennes wheel sets at 35 psi rear and 30 psi front. The GK's mounted tubeless (very easy install and excellent air retention), and the Bon Jon's with Challenge latex tubes. The Bon Jon's are very fast on pavement and handle most of the unpaved roads I usually ride quite well. The GK's aren't quite as fast on pavement, but give me some security on lose gravel and sand. Both might fit your bike; but if I had to recommend only one tire, it would be the Bon Jon's. Great tire. BTW, one of the advantages claimed by Compass, is that because of the supple casing used on the Bon Jon's, their actual rolling resistance is unaffected by running at typical low psi like 35/30 psi. I can confirm that on high speed group gallops this winter, I more than held my own in our group rides against other roadies in my group on Hilton Head Island riding my Bon Jon's at 35/30.
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chas

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Reply with quote  #8 
I have 20mm rims, and both 40 and 38 ramblers. They both were about 3mm less than advertised. Search my posts for specifics
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chas

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Reply with quote  #9 

Measuring a frame is a bit tricky.  I’ve squeezed some tight tires in.  some of the issues I have found:  the taller the tire the farther it goes into the skinny part of the frame.  Although I may have 5mm on each side of a 32mm tire, I may not be able to get a 40mm tire to fit as the stays are narrower at the narrow point of the taller tire.

 

I think the industry standard for tire clearance is 5-6mm.  Many recommend a minimum of 3mm clearance at any point to account for a wheel getting out of true, tire damage, debris, tires that expand over time (mostly high end tires), & wheel flex under power.

With that said, 35 is about as big as you can go on your frame without bumping up to these issues.  If you want more cushion, get some better tires and/or ride at lower pressure.  45psi will give you a pretty nice ride on a good tire, unless you are riding really rough stuff.  Then you can use your monstercross. 

;-)

 

(My 38mm ramblers initially measured about 34mm, but I think they have relaxed and expanded a few mm as they got broken in).  



Quote:
Originally Posted by tim.bikeparty
Hey folks, i recently purchased an Ibis Hakkalugi to be a more speed-oriented gravel/cx bike to compliment my BMC monster cross.

i am looking for some good gravel tires that are 37-38mm wide.  i have 35's that just don't give me the cushion i want and the frame max's out at about 40mm

IMG_9048.JPG 

I've been looking at either the Challenge Gravel Grinder 38s, Maxxis Rambler 38s, or WTB Riddler 37s.  Can anyone confirm the actual width of these?  i've seen tires run 2, 3, even 5mm off of their claimed diameter, and I'd hate to drop $100+ on a set of tires only to have them not fit or just be 35's with a napoleon complex.

My rims are about 19mm internal width.

Are there any others i'm missing that are in that width? (regardless of claimed size)

Thanks![/QUOTE
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Nbudor

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Reply with quote  #10 
Challenge gravel grinder are spot on 38mm wide on Pacenti TL28 rims.Cheers!
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goneskiian

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Reply with quote  #11 
The Specialized Trigger 38c might be another option. I've seen they run a bit smaller than advertised on narrower rims but on my 21 internal rims they were pretty true to size (don't recall exactly the measured width). 

+1 for Compass Bon Jon's too. Man do they roll nicely. Have them set up tubeless at the moment and they've done great, even on some rougher gravel bits.

Cheers!
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sgtrobo

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Reply with quote  #12 
Quote:
Originally Posted by goneskiian
The Specialized Trigger 38c might be another option. I've seen they run a bit smaller than advertised on narrower rims but on my 21 internal rims they were pretty true to size (don't recall exactly the measured width).


I'll give a +1 on the Trigger Pro 38s.  Easy to run tubeless, true to size
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