Jumbo Jim First Ride
12-29-23, 07:01 PM
#1
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Join Date: May 2014
Location: FL USA
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Bikes: 1977 Tom Kellogg Nr. 27 - 1984 Bob Jackson - 1987 Alpineer - 1999 Bianchi - 2002 LeMond Buenos Aries- 2007 Specialized Tarmac Pro - 2017 Mongoose Argus Comp FatBike - 2024 Gravity 29er 1-Speed Monstercross
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Jumbo Jim First Ride
I replaced my 6-year old Kenda Juggernaut 4.5 with Schwalbe Jumbo Jim 4.8. Although the Juggernauts had less than 40 miles on them (I bought my 2017 Mongoose Argus Comp recently with only 10 miles on it), I think they simply aged-out. They had become stiff/hard. The gum sidewalls developed dozens of cracks and they made an odd squishing noise. So I ran the new Jumbo Jims this morning with 10PSI front / 12 PSI rear as a starting point. First impression of the tire? I guess I would say supple. And stone cold silent! The squishing was so loud in the Kenda's, it was like a warning siren for anything ahead on the trail. The trails I ride are in the south central Florida 'jungle' frequented by bobcats, bear, panthers and large wild hogs. It was a bit eerie this morning riding this narrow single track in complete silence! 
I was just waiting to come around a blind corner and have something staring back at me 
Love the tires. Traction is excellent and the larger size swallows up even larger roots and obstacles. I didn't play with pressures but next time out I plan to try 8F/10R psi. The tires 'feel' lighter, not sure if that is the actual case. Still running tubes because I'm doing a long ride through the Everglades soon and did not want to experiment with the tubeless conversion right before that ride.
I was just waiting to come around a blind corner and have something staring back at me Love the tires. Traction is excellent and the larger size swallows up even larger roots and obstacles. I didn't play with pressures but next time out I plan to try 8F/10R psi. The tires 'feel' lighter, not sure if that is the actual case. Still running tubes because I'm doing a long ride through the Everglades soon and did not want to experiment with the tubeless conversion right before that ride.
Last edited by cegerer; 12-29-23 at 07:26 PM.
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12-30-23, 06:03 PM
#3
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Join Date: May 2014
Location: FL USA
Posts: 165
Bikes: 1977 Tom Kellogg Nr. 27 - 1984 Bob Jackson - 1987 Alpineer - 1999 Bianchi - 2002 LeMond Buenos Aries- 2007 Specialized Tarmac Pro - 2017 Mongoose Argus Comp FatBike - 2024 Gravity 29er 1-Speed Monstercross
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09-16-24, 09:48 AM
#6
meh
Join Date: Jul 2014
Location: Hopkins, MN
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Bikes: 23 Cutthroat, 21 CoMotion Java; 21 Bianchi Infinito; 15 Surly Pugsley; 11 Globe Daily; 09 Kona Dew Drop; 96 Mondonico
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I replaced my 6-year old Kenda Juggernaut 4.5 with Schwalbe Jumbo Jim 4.8. Although the Juggernauts had less than 40 miles on them (I bought my 2017 Mongoose Argus Comp recently with only 10 miles on it), I think they simply aged-out. They had become stiff/hard. The gum sidewalls developed dozens of cracks and they made an odd squishing noise. So I ran the new Jumbo Jims this morning with 10PSI front / 12 PSI rear as a starting point. First impression of the tire? I guess I would say supple. And stone cold silent! The squishing was so loud in the Kenda's, it was like a warning siren for anything ahead on the trail. The trails I ride are in the south central Florida 'jungle' frequented by bobcats, bear, panthers and large wild hogs. It was a bit eerie this morning riding this narrow single track in complete silence! I was just waiting to come around a blind corner and have something staring back at me Love the tires. Traction is excellent and the larger size swallows up even larger roots and obstacles. I didn't play with pressures but next time out I plan to try 8F/10R psi. The tires 'feel' lighter, not sure if that is the actual case. Still running tubes because I'm doing a long ride through the Everglades soon and did not want to experiment with the tubeless conversion right before that ride.
I was just waiting to come around a blind corner and have something staring back at me Love the tires. Traction is excellent and the larger size swallows up even larger roots and obstacles. I didn't play with pressures but next time out I plan to try 8F/10R psi. The tires 'feel' lighter, not sure if that is the actual case. Still running tubes because I'm doing a long ride through the Everglades soon and did not want to experiment with the tubeless conversion right before that ride.I 'stole' Frau Toad's JJ tires earlier this year, and after loving my Panaracer Fat B Nimble tires for years, but they are discontinued ... I was VERY happy with the JJ. Here's a link to a thread on my 'tire test' (and a link to my blog) https://www.bikeforums.net/fatbikes/...tire-test.html
In fact, these JJ tires were part of my DAMn ride, setting the course record on a fatbike: https://www.bikeforums.net/23319673-post37.html
Last edited by Hypno Toad; 09-16-24 at 09:49 AM. Reason: forgot a link
