Bontrager Jones ACX 29-inch 29er Tire

3.44/5 (16 Reviews)
Weight : 570 grams


Product Description

Very fast-rolling tire with above average hookup in technical situations. Tall, widely-spaced knobs make this the best mud tire for 29'ers, yet it also works well in hardpack.
  • Kevlar® bead
  • 2.2 width (looks like a 2.1 when inflated)
  • 120 TPI
  • Black with black sidewalls
  • Front or rear use
  • Do not use as tubeless


  • Review Options:  Sorted by Latest Review | Sort by Best Rating

    Reviews 1 - 15 (16 Reviews Total) | Next 15

    User Reviews

    Overall Rating:5
    Value Rating:5
    Submitted by dmh a Weekend Warrior from Winnipeg, MB, Canada

    Date Reviewed: November 4, 2010

    Strengths:    light weight even with tube. great rolling even on paved, noisy on hard pack. great in mud.

    Weaknesses:    pressure sensitive, you have to set it perfect or you have wrinkled sidewalls.

    Bottom Line:   
    I like to change my factory tires on everything I get. I didn't even consider it for the bike and how i ride it. I always ride semi slicks so for this tire to satisy my ride is a hard deal for a mud tire. I worry about finding replacements

    Expand full review >>

    Favorite Trail:   burr oak, winnipeg urban river trails

    Duration Product Used:   2 Years

    Purchased At:   alter ego sports win

    Similar Products Used:   no other 29ers

    Bike Setup:   factory parts from Gary Fisher '08 x-caliber except '09 paragon frame, cranks and SRAM X-9 deraillers, 1664 shave beaver traps.

    Overall Rating:1
    Value Rating:3
    Submitted by Bigjake29er a Cross Country Rider from York, PA

    Date Reviewed: August 22, 2010

    Strengths:    Great traction and light weight.

    Weaknesses:    Very prone to punctures

    Bottom Line:   
    I'm glad I purchased these tires on clearance! 3 weeks and 100 miles of riding I had to replace these tires due to the sidewalls wearing through. If you ride a lot of rocky terrain like we have here in Pennsylvania these tire are not for you!

    Expand full review >>

    Favorite Trail:   Curse of the Dark Hollow

    Duration Product Used:   Less than 1 month

    Purchased At:   LBS

    Similar Products Used:   WTB Exiwolf


    Overall Rating:4
    Value Rating:4
    Submitted by j porter a Cross Country Rider from Saroga Springs, Ny

    Date Reviewed: November 28, 2009

    Strengths:    Hooks up in loose conditions, light, seats up w/ Stan's rim strips well, no burping so far, no flats so far, supple feel

    Weaknesses:    Side nobs squirm on hard surfaces such as exposed rock faces

    Bottom Line:   
    I like the tire so far. Rocks that are off camber are the main issue. The tire works well in wet loose conditions. I put the tire on because the trails are soupy and loose from a month of rain. It rolls pretty fast and is light.

    Expand full review >>

    Duration Product Used:   Less than 1 month

    Similar Products Used:   Kenda Nevegal

    Bike Setup:   Willits Trail King, XT, BB7, WB Magic fork

    Overall Rating:1
    Value Rating:1
    Submitted by Weminuche a Cross Country Rider from Durango, CO

    Date Reviewed: August 29, 2009

    Strengths:    light weight, clears mud well

    Weaknesses:    front washes out, quick wear on center rear tread

    Bottom Line:   
    really liked these tires initially, felt they were light and handled well on climbs and descents. BUT, then I had two horrible wrecks that cost me weeks of pristine ride time due to the front tire washing out while cornering at high speed on dry single track i've never had problems on. LBS confirmed that reputation. very dangerous in the mountains.

    Expand full review >>

    Favorite Trail:   Colorado Trail

    Duration Product Used:   1 Year

    Purchased At:   Stock on GF Rig

    Similar Products Used:   bontrager XR, Panaracer Rampage

    Bike Setup:   Gary Fisher Rig - was stock when I was using these tires

    Overall Rating:5
    Value Rating:5
    Submitted by klrmtn a Weekend Warrior from Byron, IL

    Date Reviewed: February 21, 2009

    Strengths:    Good traction, handles lower pressure with tubes great

    Weaknesses:    none that I have run into

    Bottom Line:   
    I have found the Excalibur with the stock Jones ACX to offer great traction and good rolling capabilities. These are the only 29" tires I have had so far, but compared to other 26" tires, there is no comparison. I have not had any issues with side wall rips, the knobs are holding on well. I haven't typically had flatting problems, and these tires haven't changed that. I typically ride in the dry, loose over hardpack with some sand and lots of roots. They grab and move me forward. I think some of it is from the 29", and some of it is from the tread pattern. I run them with tubes at 28 to 30 psi.

    Expand full review >>

    Favorite Trail:   Rock Cut

    Duration Product Used:   1 Year

    Price Paid:    $1.00

    Purchased At:   Rockford Bicycle Co

    Similar Products Used:   26" tires,wtb velociraptors, Michlin XT,

    Bike Setup:   Gary Fisher Excalibur with stock Jones ACX tires

    Overall Rating:5
    Value Rating:5
    Submitted by Apache Chief a Cross Country Rider from Winston-Salem, NC

    Date Reviewed: January 28, 2009

    Strengths:    Great in dry or wet conditions. Great on climbs and descents. Hooks up well wih roots and rocks. Light and responsive.

    Weaknesses:    Not found any yet

    Bottom Line:   
    If you’re a 29er newbie or a vet you’ll find these tires will work well in all conditions.

    I've found running the maximum air pressure at 65 psi works best for me on a 29er; I guess it is the longer contact patch. 65 psi seems to help push away and shed off mud better and on a dry trail hook up better with rocks and roots. The thing I like about the Jones ACX is they are one of the lightest 29er tires on the market. Rotational weight is the best place to save on weight plus the bike is more responsive; which is a big help on a 29er. Besides having a light, stiff and strong frame a light weight tire may be the less expensive upgrade compared to other weight saving upgrades.

    Expand full review >>

    Favorite Trail:   Dark Mountain/Overmountain Victory Trail

    Duration Product Used:   6 months

    Price Paid:    $50.00

    Purchased At:   Paceline Bicycles

    Similar Products Used:   WTB Veloci Raptor & WTB Weirwolf, Kenda Small Block Eight

    Bike Setup:   Gary Fisher 29er

    Overall Rating:3
    Value Rating:3
    Submitted by jk a Cross Country Rider from marsh creek pa

    Date Reviewed: January 10, 2009

    Strengths:    relatively lightweight

    Weaknesses:    weak sidewalls, not so good in the mud

    Bottom Line:   
    unless you ride on trails with only a few rocks i would avoid these tires. i ride on a lot of rocky/muddy trails in pennsyltuckey and these don't cut it. after a few rides the sidewalls were wearing thin and they don't perform well in mud. if i rode predominantly smooth dirt or loamy conditions i would consider running these because they are fairly lightweight, but so far nothing beats a nevegal!!!

    Expand full review >>

    Duration Product Used:   6 months

    Similar Products Used:   nevegal, exiwolf, ignitors

    Bike Setup:   came stock on a gf sugar 293

    Overall Rating:5
    Value Rating:5
    Submitted by davo a Weekend Warrior from san jose, ca usa

    Date Reviewed: September 3, 2008

    Strengths:    great for norcal fire trails. excellent climber on loose, rocky, dust-topped conditions. wouldn't trade them in for any other tire.

    Weaknesses:    none!

    Bottom Line:   
    these tires are oem on bike when purchased. highly recommended for open trail loose conditions. they dig and bite when needed. once you give them a try, there's no going back to other options. Haven't used them in wet weather conditions yet.

    Expand full review >>

    Favorite Trail:   sierra azul

    Duration Product Used:   6 months

    Purchased At:   summit bike, los gat

    Similar Products Used:   maxxis cross+mark. wtb nanoraptor

    Bike Setup:   stock gary fisher superfly

    Overall Rating:2
    Value Rating:2
    Submitted by Super29 a Weekend Warrior from Gateway City, Missouri USA

    Date Reviewed: April 7, 2008

    Strengths:    These came stock on the bike. Lightweight and can be made tubeless.

    Weaknesses:    These tires cut far too easily. In my first ride with the tires on a moderately rocky trail I sliced a 1" gap in the tread.

    Bottom Line:   
    Light weight, but not ready for any type of rocky terrain.

    Expand full review >>

    Favorite Trail:   Any Singletrack

    Duration Product Used:   Less than 1 month

    Purchased At:   Came with bike

    Similar Products Used:   Reading the site right now to find replacement. My 26" had WTBs that never cut a tire on this same trail.

    Bike Setup:   Fisher Paragon - stock.

    Overall Rating:4
    Value Rating:5
    Submitted by Derek a Cross Country Rider from Chadds Ford, PA

    Date Reviewed: January 13, 2008

    Strengths:    Great mud tire
    Endless Traction
    Great Cornering
    Solid AT Tire


    Weaknesses:    Slow Rolling, sort of

    Bottom Line:   
    This tire is excellent in slushy mud, sticky mud, and most other types of mud. It corners well, rides reasonably soft, and gives you confidence. It also isn't that heavy, and the new TLR versin can be set up tubeless.

    Expand full review >>

    Favorite Trail:   David English, White Clay Creek, Brandywine Creek

    Duration Product Used:   3 months

    Price Paid:    $1.00

    Purchased At:   Newark Bike Line

    Similar Products Used:   Panarcer Rampage, Geax Saguaro, Kenda Small Block Eight, Bontrager XR, WTB Exiwolf, Mutano Raptor

    Bike Setup:   2008 Gary Fisher Rig, Fox, Race X Lite Grips and Stem, Race Lite Bar, Ti Seatpost, Selle Italia Storika Saddle,

    Overall Rating:5
    Value Rating:4
    Submitted by Caleb Janicich a Cross Country Rider from Beaverton, OR USA

    Date Reviewed: November 14, 2007

    Strengths:    Great climber!
    Great Cornering! Great downhill.
    No troubles with flats, punctures, very durable so far!
    Very good feel. Drifts well.
    Just rails around corners. If you hit it too fast, just drift until you hit a rut and keep a goin!
    Tubless Ready!


    Weaknesses:    Very soft side lugs. (not a problem for me, but soft nonetheless)

    Bottom Line:   
    I've taken this thing over rocks, jumps, technical descents, technical ascents. It's never failed me.
    Rode it on a trail that almost ALWAYS gives me a flat on my Panaracers, no flat!
    I'm running it tubed, haven't gone tubeless yet. Handles great out here in OR.
    Highly recommended for muddy wet climates.
    Grips the mud like no other. Just point and go.
    Looking for confidence in the mud? Here look no further.

    Expand full review >>

    Favorite Trail:   Tillamook!

    Duration Product Used:   3 months

    Price Paid:    $34.00

    Purchased At:   Vancouver Cyclery

    Similar Products Used:   26" tires Panaracer Fire XC Pro, Panaracer Cinder, Michelen All Mountain

    Bike Setup:   08' Hi-Fi Pro 29er

    Overall Rating:1
    Value Rating:1
    Submitted by Scott L a Weekend Warrior from St. Louis, MO

    Date Reviewed: October 1, 2007

    Strengths:    Hooks up well on hard packed surfaces and grabs well on dry trails.

    Weaknesses:    WEAK SIDEWALLS! I have gone through (2) rear tires within a 3 month period. Maybe 12 rides. Scary on damp rocks and roots. NO GRIP in wet stuff.

    Bottom Line:   
    I will never buy another one of these. I lost both tires to sidewall damage. The second tire lasted to the end of the third ride I took on it. I have ridden the same trails for 10 years and have never lost any other tire. This is a weak tire and is spooky on damp-to-wet trails. If you are a flat trail rider and stick to dry surfaces, it works just fine.

    Expand full review >>

    Favorite Trail:   Chubb

    Duration Product Used:   3 months

    Similar Products Used:   Velociraptors and Panaracer on 26".

    Bike Setup:   Stock 293 GF.

    Overall Rating:4
    Value Rating:4
    Submitted by Peter Ryckaert a Weekend Warrior from Victor, NY, USA

    Date Reviewed: August 13, 2007

    Strengths:    Tire has mad grip on dry semi-loose surfaces. It's early but it seems to be holding up. No wet testing so far. Keeps the bike bolted to the ground. Ride quality seems just fine.

    Weaknesses:    It's wide enough that my Orbea Alma 29er just has the clearance in the back.

    Bottom Line:   
    This tire is a match for our trail. I can't comment on rocks or damp singletrack. It's dry, dusty and semi-loose this summer.

    Expand full review >>

    Favorite Trail:   Dryer Road

    Duration Product Used:   Less than 1 month

    Price Paid:    $25.00

    Purchased At:   OEM

    Similar Products Used:   Lower-end Bontrager with shorter knobs (not enough bite).

    Bike Setup:   Orbea Alma carbon 29er hardtail. Oem heavy wheels.

    Overall Rating:4
    Value Rating:1
    Submitted by David Dalessio a Cross Country Rider from saint peters mo

    Date Reviewed: January 8, 2007

    Strengths:    decent traction in dry to damp conditions

    Weaknesses:    Horrible in wet and even worse in mud. side walls are VERY thin get ripped very easy in rocky conditions

    Bottom Line:   
    would be good for someone that only rides on dry dirt or pavement. I would not recomend this tire to purchase.I switched to maxis ignitor after the side walls got tore up in less than a month/200 miles and the difference is huge the traction is awsome the side walls are alot more durable and traction in shallow mud is alot better.

    Expand full review >>

    Favorite Trail:   the ranch

    Duration Product Used:   Less than 1 month

    Purchased At:   came on bike

    Similar Products Used:   maxis ignitor

    Bike Setup:   07 supercaliber29 marybars,maxis ignitor tires,everything else is stock

    Overall Rating:2
    Value Rating:3
    Submitted by Stefan Griebel a Cross Country Rider from Boulder, CO, 80303

    Date Reviewed: December 21, 2006

    Strengths:    Pretty lightweight, pretty knobby, but still rolls relatively fast.

    Weaknesses:    Soft rubber knobs wear quickly. I had more puncture flats with these tires than any other.

    Bottom Line:   
    These are a good all-around tire, but I wouldn't buy them again, because there are so many other good choices out there now. I hated how the tiniest thorn would give me a flat, and these tires also wore out quicker than any others I have ridden.

    Expand full review >>

    Favorite Trail:   Colorado Trail

    Duration Product Used:   1 Year

    Purchased At:   Came with my GF-292

    Similar Products Used:   Conti Vapor Pro's, Kenda Klaw XT's, Exiwolves, Nanoraptors, Motoraptors

    Bike Setup:   Rode these on my GF-292 only

    Reviews 1 - 15 (16 Reviews Total) | Next 15

    Review Options:  Sorted by Latest Review | Sort by Best Rating


    Jones ACX 29

    Are these tyres crap or am I just very unlucky as I have had 4 punctures on since buying my RIG less than a year ago. I am about 5'11 and way less than 12 stone so I dont think they are under any undue stress. Anyone else had any problems with these tyres and can anyone recomend any better tyres? ... Read More »

    Read More »



     

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