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Challenge
Gravel Grinder Race Tire

  (39 customer reviews)
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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.

 

ISO (ETRTO) Size: 38-622 

 

Max Pressure: 80 PSI

 

Threads Per Inch: 120 TPI

 

Made in: Thailand 

Black - 700 x 33mm

Weight: 408 grams

Black - 700 x 38mm (Tube only)

Weight: 408 grams

Black - 700 x 42mm (Tube Only)

Weight: 425 grams

Black - 700 x 38mm Tubeless Ready

Weight: 355 grams

Black - 700 x 42mm Tubeless Ready

Weight: 355 grams

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Out of the saddle in loosey goosey gravel...no problem
rating
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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I love these tires! I always go with Challenge
rating
by Jeremy
Richmond, Va

Challenge never lets me down, they have a wide range of tires, some with gum wall options. The tread on the gravel grinders is just what I want between commuting on pavement or hitting off road.

Reviewed 3/9/2018
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Great all around tire
rating
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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Nice rolling
rating
by Aaron
Lincoln, NE
1 of 1 customers found this review helpful.

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 Tire for Gravel, Road or Mud!
rating
by Tinbender75
Cycling Enthusiast
Oklahoma City
6 of 6 customers found this review helpful.

When I got my cyclocross bike I primarily got it for gravel and after riding with the stock 32 tire on gravel I decided to try something different. The stock tires walked a lot on gravel and were slow when I was on the road. I read a review of the Gravel Grinders by Guitar Ted and decided to try them. I have rode about 500 miles on them and I love them. No more walking on gravel unless it is very loose. They are fast on the road as well despite their size due to the file tread pattern in the middle of the tread. I had a lot more control on mud as well with them. Mud does like to stick to the sides due to tread on the sides. I highly suggest them and I haven't found anyone who doesn't like them.

Reviewed 1/12/2015
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Great all rounder for all-road riding
rating
by Anonymous
Cycling Enthusiast
New Hampshire
4 of 4 customers found this review helpful.

I ride lots of dirt roads and rail trails in New England. These are the best all round ones I've found so far (have ridden Vittoria XG, Maxxis Mud Wrestler, Clement MSO 40's). They are light for a 38mm, wide enough to avoid pinch flats, quiet and fast enough on pavement, and provide great traction on a wide variety of surface and allow you to stand on graveldirt hill climbs. They dampen the ride without being too bouncy.

Reviewed 9/6/2014
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Excellent budget tires
rating
by Anonymous
Central Indiana
1 of 1 customers found this review helpful.

I've got a few hundred miles on these tires now-a pretty even mix of good aged chip & seal, fresh loose chip & seal, crappy patched and potholed chip & seal, and plush marble-sized river-rock gravel. I don't notice any real rolling resistance on pavement, and they stick like Velcro even in the really deep gravel. I haven't climbed much, but the bit of climbing I've done was fine and more importantly I had full control on the descent. I am running them with tubes at 55ish psi, haven't had any flats (punctures aren't likely here, no thorns or sharp rocks) and they do a pretty good job at smoothing out all but the worst bone-shakers. I'd definitely recommend these as a good all-around tire.

Reviewed 8/8/2018
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Good pavementgravel tires
rating
by Anonymous
Cycling Enthusiast
Enterprise, OR

After riding with these tires for a few weeks I am quite pleased. I ride probably 75% pavement and 25% gravel and appreciate the fast rolling qualities of this tire with ability to ride at a variety of pressures depending on conditions. So far so good!

Reviewed 10/8/2018
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Go To Gravel Tire
rating
by Kahola Kahuna
Cycling Enthusiast
Flint Hills KS
16 of 17 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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On road off road perfect
rating
by Viva velo
Cycling Enthusiast
Grand Junction.Co

Not slow on pavement and very stable and quick on dirt roads and tracks. This is the one tire for everything on my Specialized Crux.

Reviewed 8/23/2018
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Worked well for me
rating
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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Lives up to it's name admirably!
rating
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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Go-to adventure tire
rating
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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Perfection for commuter-training or Outright Gravel Road Racing!!
rating
by Chicago J
Cycling Enthusiast
Chicago IL
15 of 17 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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Durable, versatile tire for all season use
rating
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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Wow! Maybe a little narrower than advertised
rating
by jamisjockey
Cycling Enthusiast
Virgina

I've only got one ride on these but I'm super happy with them! My clement tires aren't very confident cornering, even on the road. These challenge tires transition real well in corners and lock up nicely on gravel. Reasonably fast on road or dry hardpack as well. Corner well in gravel.

I mounted them on a pretty narrow pair of road rims (vuelta) and my micrometer says they're more like 32's on these rims.

Reviewed 4/21/2018
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Sweet, tough tire for Hoosier gravel
rating
by Anonymous
Cycling Enthusiast
Louisville ky
1 of 1 customers found this review helpful.

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.
rating
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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Excellent tire for fast gravel riding in all but muddy conditions
rating
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
rating
by Anonymous
Cycling Enthusiast
iowa

many 100 mile rides no problems yet

Reviewed 12/26/2016
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