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Challenge
Gravel Grinder Race Tire

SALE: $40.79ea.
MSRP:$47.99
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With an eye towards long demanding gravel rides like the Dirty Kanza, Trans Iowa, and others, Challenge presents the Gravel Grinder Race Tire.

While many of Challenge's previous tires are right at home on gravel, they wanted this one to be specially tailored for longer, more demanding rides where tire width and flat protection are at a premium. To this end, they gave the Gravel Grinder Race their Double Puncture Protection System (PPS2) and spec'ed it with a generous 38mm width, resulting in great durability and dependability with comfort and stability on uneven and loose terrain. With file tread in the center, the Gravel Grinder roles smoothly, but still grips turns thanks to its more aggressive shoulder knobs.

The Gravel Grinder Race Tire is available in 700c x 38mm (38-622 ISO). Inflation range 45-80 PSI. 120 TPI casing. Claimed weight of 408 grams.

 

Weight: 408 grams

 

Weight: 408 grams

 

ISO (ETRTO) Size: 38-622 

 

Max Pressure: 80 PSI

 

Threads Per Inch: 120 TPI

 

Made in: Thailand 

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Go To Gravel Tire
by Kahola Kahuna
Cycling Enthusiast
Flint Hills KS
11 of 11 customers found this review helpful.

I live in Kansas and am from Emporia, the heart of Dirty Kanza and Flint Hills territory. I have used these tires thru 3 Dirty Kanzas, 2 Almanzos, 1 epic fail at Landrun(mud and weather, tires were fine) and countless other rides and races through Flint Hills Gravel. Two flats, both were pinch flats and totally my fault for running too low of pressure under my 190 lbs. About 53-55 PSI rear and 48 PSI front seems to keep me out of pinch flat trouble even in the Flint Hills Gravel. Rolling resistance is minimal on hard pack, yet traction remains great in the loose stuff. They do tend to wear a little fast, but at the price and weight well worth it. As a side note, on the two flats I did have, they go on and off the rims using no levers for a quick change under the stress of race conditions. In gravel cycling the tire of the moment always seems be in every conversation, but I have found no need to experiment or go tubeless with these tires around and will continue to run the Gravel Grinders.

Reviewed 5/16/2017
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Worked well for me
by TK
Ohio
1 of 1 customers found this review helpful.

Got these for my CX bike and a gravel race. Running them with latex tubes. Race had some single track with hills and some mud. Surprised how well the gripped. Have now been running them on pavement and see that my average speed is not much slower than on my road bike. No flats. Very pleased.

Reviewed 1/11/2017
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just what I wanted
by Anonymous
Cycling Enthusiast
upstate New York

Just what I was looking for. The larger size fits and will be usable for both paved and dirt roads. Plan to buy a 33 for my wife's bike once they are in stock.

Reviewed 12/14/2017
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Durable, versatile tire for all season use
by runningisfree
Cycling Enthusiast
Wayne, PA

I use on my cross frame which doubles as a commuter. I pump up tire to 65 psi and it gives a comfortable ride.

Reviewed 7/20/2017
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Sweet, tough tire for Hoosier gravel
by Anonymous
Cycling Enthusiast
Louisville ky

Originally went w the 33s for tackling the (awesome!) Hoosier National Forest roads. Loved the tires but found them too narrow for some of the loose gravel. Bumped up to the 38s and they are perfect. Expertly manage the slime of sloppy lime dust but also do a better job of floating over loose gravel. Excellent on dry hard packed gravel and tough enough for the occasional bit of singletrack. Roll nicely over paved sections. About 1000 miles without a flat. Have tried them tubeless but the sidewalls leak too much - not sold as tubeless so that's fair. Great tire!

Reviewed 6/24/2017
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Near perfect for use with my CX bike on gravel & mixed surface rides.
by Aaron
Cycling Enthusiast
Lincoln, ThereIsNoPlaceLikeNebraska
1 of 1 customers found this review helpful.

I live in the city with streets and paved bike paths, but I'm at the edge of town with gravel section roads stretching to the horizons through farmland. These tires have been a welcome upgrade over the stock 33mm tires that came on my Specialized CruX. Smoother rolling center tread, knobby on the edges to bite in the loose and chunky gravel, and enough volume to lower my pressures for a smoother ride. Near perfect.

Reviewed 6/6/2017
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Super fast tires
by Anonymous
Cycling Enthusiast

These tires are very fast, they roll well, but still have good traction when needed.

They have good grip in gravel and the side knobs have enough grip to keep you from losing the front wheel if you hit an unexpected patch of deep sand. As expected they provide virtually no forward traction in deep lose sand.

The only downside is the 38mm tires measure out to 35mm on my wheels, but so far their performance has more than made up for being skinnier than advertised. I'll probably get about 800 miles out of the rear which is on par with other tires I've used.

Reviewed 11/9/2017
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Lives up to it's name admirably!
by Bnystrom
Cycling Enthusiast
Nashua, NH
20 of 20 customers found this review helpful.

I needed tires for a dirt road event in Vermont and after reading a lot of reviews, I settled on the Gravel Grinders. I wanted something wide, with reasonable rolling resistance on paved roads and hard-packed dirt, but aggressive edge lugs for cornering in looser conditions. This tire has all of that and excellent durability, too. I couldn't be happier with their performance.

FYI, at 174, I ran these at 50/55, frontrear and that was perfect on a hard-packed course. My 110 girlfriend ran them at 30/35.

Reviewed 10/4/2014
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Purchased for FallWinter trail, road and gravel riding
by Jake Oakley
Cycling Enthusiast
Lehigh Valley Pennsylvania

I have been riding with the 700x32 tires that came with my bike - worked well in spring and summer riding. Wanted to go to 38s for fall and winter. I have been riding more canal trails and plan on continuing through the fall and winter months. Have about 250 canal trail miles on these tires - they are holding up perfectly, have PSI 55 front and 65psi rear. No flats and a very comfortable and stable ride.

Great price and quick shipping.

Reviewed 11/4/2017
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Go-to adventure tire
by deebiker
Competitive Racer
Portland, OR
2 of 2 customers found this review helpful.

This tire is my go-to tire from May-mid September. I opted for the Gravel Grinder after realizing that a 40mm MSO just didn't fit right in my bike. Sacrificed 2mm of width, but gained a hell of a lot of acceleration and versatility of use. Really like that I can use this tire for the early-season races and it's super-puncture protective.

Also, even though it's not technically a tubeless tire, it hooks up like a dream on both my Stan's NoTubes wheels and my DT Swiss rims on my Asylum Meuse.

Reviewed 10/13/2014
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Out of the saddle in loosey goosey gravel...no problem
by PDX teacher biker
Competitive Racer
Portland, OR
8 of 9 customers found this review helpful.

I just put these tires on my CX bike to get some rides in before the Oregon Stampede (130 miles, 70% GRAVEL). I am a 5'3 woman so I was reluctant to put this big of a tire on my bike for fear I would think it was too slow when not riding gravel. The tires feel fine on the road but they really do shine in gravel. After riding for a few hours in Forest Park (Portland, OR, gravel roads are fire roads) I was most impressed with how I was able to get out of the saddle and accelerate in gravel, especially up steep uphill grades, without that sinking in or spin out feeling at all. The tire also feels very secure through corners (even if one has to brake through the corner to avoid a dog that should be on a leash). On pavement, the tires feel faster than traditional cross tires. If I do any early season CX racing in dry conditions I would even consider leaving these tires on for racing.

Reviewed 8/25/2014
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Perfection for commuter-training or Outright Gravel Road Racing!!
by Chicago J
Cycling Enthusiast
Chicago IL
14 of 16 customers found this review helpful.

Prior to this I have been racing on Challenges high end open tubular Grifo XS in 33mm and soon its high end open tubular Gravel Grinder in 700x36mm tire. For training and commuting I do not want to burn through [$] high end tires when I can burn through the same tread for less than half the money and have an even tougher casing than the open tubular design saving them for race day! For training I have been riding every type of nail file tread pattern I could buy, My favorite up until this tire was released was in this order, Clement Las 33mm (actually a 36mm)for fast gravel country roads and finer gravel, or for rougher gravel Clement USH 35mm, Vittoria Pro XN 32mm(actually 30mm), Schwalbe Sammy Slick 35mm (actually a 31mm), and for rougher gravel and dirt Kenda Happy Mediums in 35mm or 40mm (both slightly undersized as well. I hope that Challenge continue to make Vulcanized Versions of its already top OT tires like The Grifo Pro now, as I wish they would make a Grifo XS 32mm vulcanized soon for my wife as this is her favorite tire! Do your self a favor and get this tire, it is the best!

Reviewed 7/18/2014
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Nice rolling
by Aaron
Lincoln, NE

As the hosts of the unofficial Gravel Worlds, you'd imagine we've got plenty of gravel around Lincoln, Nebraska and we do. I settled on a 38mm set of these to roll on my CX to give me a little more width, but still roll well. They do their job well. Riding on pavement, they're smooth. Riding all types of gravel they handle well too.

Reviewed 9/17/2017
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Great Gravel Tire
by Anonymous

Bought these for Rasputitsa and they delivered. The wider version of the Chicane, these puppies hook right up in packed snow in Cyberia and the side lugs hold when it gets a bit sketchy. Bought a second set after riding these.

Reviewed 9/21/2017
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Good tire overall
by Anonymous

Good all around Gravel grinder but a bit on the heavy side

Reviewed 9/17/2017
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Great all around tire
by Anonymous
Cycling Enthusiast
Oregon

I use this tire to commute(20 miles a day) and also hit the logging roads nearby. Fast on the pavement and grippy on the hard pack.

Reviewed 1/18/2017
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Excellent tire for fast gravel riding in all but muddy conditions
by Anonymous
Cycling Enthusiast
Lawrence, KS

Great, light gravel tire, rolls fast, stable in corners.

Reviewed 1/6/2017
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tis is a fast gravel tire
by Anonymous
Cycling Enthusiast
iowa

many 100 mile rides no problems yet

Reviewed 12/26/2016
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Solid Gravel Tire
by Gravel T
Seattle
2 of 2 customers found this review helpful.

I purchased these after experiencing reliability issues with another tire. I found myself riding hard-core gravel and wanted a tire that could withstand the punishment, but still provide good rolling resistance on pavement. For me, it was between these and the MSOs. I ran the Gravel Grinder Race for 8 months with acceptable results.

A few notes Tubeless performance was unsatisfactory. This was disappointing, but they were not sold as tubeless ready, so what can you do? This is the main reason I don't run these anymore, and why i gave only 4 stars. Another observation is those larger side knobbies. To me, they seemed like a distraction. I did not like the way they felt underneath when they engaged. It felt like the tire changed its characteristics whenever in a hard cornering situation (which is where I want it to be the most consistent). Get rid of the side knobbies, they're dumb.

The tire looks good, rolls well, and is reasonably tough. It's a good alternative to Clement MSO or even USH. Do not expect to run these tubeless. I found they wore a little faster than I'd hoped for.

Reviewed 12/4/2016
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Held up well on the C&O Canal trail.
by Anonymous
Casual Cyclist
Pittsburgh PA

With over 200 miles on rough roadbed, the tread is still much like it was when new.

Reviewed 8/11/2017
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