I’ll second what Hoch said. I don’t notice very much difference between a 2.6 and a true 3.0 in sand. 4” plus is all that has helped.
On Thursday, June 2, 2022 at 9:29:50 AM UTC-7 Hoch in ut wrote: > Make sure a 3” tire will be enough for you. I’ve ridden deep sand in > southern Utah. 3” tires (Chupacabra and XR4) were ok. You’re still putting > out a ton of wattage to keep going, especially on climbs. > Nothing beats fat tires. 4” or bigger. Get yourself a fat bike with light > carbon rims and fast rolling tires. > > On Wednesday, May 25, 2022 at 7:00:20 PM UTC-6 Patrick Moore wrote: > >> Thanks again, Keith. I want to hold out for true 3"/76 mm tires and 5 mm >> clearance at all 4 stays, and from such research as I've done, the Krampus >> and one other off-shelf bike which I forget -- in my archive -- should >> allow this with a =/< 160 mm Q, which is the goal (again, single speed), as >> also of course would a custom. >> >> On Wed, May 25, 2022 at 3:17 PM iamkeith <[email protected]> wrote: >> >>> I think I responded to the question last time, but just in case: >>> >>> I have my 1st run, size L Susie set up with 29x2.8 tires, measuring at >>> least 74mm on 42mm rims, with a 3x9 drivetrain. My tires don't have huge >>> knobs, but there are no absolutely no clearance or interference issues >>> anywhere, in any gear. By far the biggest constraint is the height of the >>> fork crown. If it was higher, I could and would put fenders on the bike, >>> too. >>> >>> If I can find a 2.6 tire that I like, I will eventually switch to >>> those. I want fenders,. And the 2.8 tires are fine on dirt but have a >>> little too much self-steer on hard surfaces. >>> >>> On Wednesday, May 25, 2022 at 2:55:14 PM UTC-6 Patrick Moore wrote: >>> >>>> Thanks, Erik and others. Garth, come to think of it, I think that I did >>>> ask this before -- more Ralph Wiggumry. Oh well. >>>> >>>> And I would prefer disc brakes, tho' that's not a deal breaker. >>>> >>>> Also, any Monocog replacement would be a single speed, or perhaps use a >>>> hub gear -- typical wide range 3 speed or perhaps a 2 speed kickback; but >>>> probably just a simple single speed. >>>> >>>> The dealbreaker tho' is 76 mm tires with 5 mm clearance on each side, >>>> so 86 mm between stays at tire level. >>>> >>>> Garth, I find that an extra cm of width and corresponding 5 psi or so >>>> drop in pressure makes a huge difference when negotiating sand. 60 mm at >>>> 19 >>>> psi is much better than 50 mm at 23 psi, but 71-2 mm at 13-15 psi is even >>>> better, and 76mm+ I daresay would improve things further. >>>> >>>> On Tue, May 24, 2022 at 11:28 PM Erik <[email protected]> wrote: >>>> >>>>> Well, that sand looks brutal! As you noted, the max listed tire size >>>>> on the Gus or Susie is 2.8, but I feel like that would be pushing it for >>>>> a >>>>> couple of reasons. I'm running 29" x 2.5 Terravail Ehlines. They measure >>>>> about 62mm without any weight on them on Cliffhanger rims, tubeless. >>>>> They >>>>> have plenty of clearance on the sides (about 12mm on the front, a little >>>>> less in the rear). I measured the distance between the inside of the >>>>> chainstays and it looks like it's right about 80mm (I wasn't measuring >>>>> with >>>>> calipers!), so I don't think you could fit 3" tires (about 76mm) with any >>>>> meaningful room to spare. The forks have a little more clearance so >>>>> maybe >>>>> a slightly larger front tire would be possible. >>>>> >>>>> The bigger issue that I would see with trying to get even larger tires >>>>> on the back is the bottom bracket width necessary to keep the chain off >>>>> of >>>>> the tire. It would push the chainline out pretty far. It's a 73mm shell >>>>> and I'm running a 122 IRD bottom bracket with spacers. Even with that >>>>> and >>>>> a chainline that is waaaay outboard, the chain runs pretty close to the >>>>> tire in the 50t gear in the back. I think that if I sized up even to the >>>>> 2.8 I might have to switch up to a 127 BB, pushing the chainline out even >>>>> further. You almost need Boost spacing at that point to push the >>>>> cassette >>>>> further out in line with the front chainring. Otherwise the front >>>>> chainring is starting to line up with the smallest cog which makes for a >>>>> terrible chainline. That's my amateur opinion at any rate! I'm sure >>>>> someone on here has tried it or knows this better than I do. >>>>> >>>>> Otherwise, even with "just" 2.5 inch tires it's handled the terrain >>>>> just fine and was easy to keep on track on multiple surfaces, including >>>>> rocky sections and sections with lots of roots and loose gravel. It was >>>>> equally fine with all of it. Sand, however, is another matter. We don't >>>>> have much of that on the trails in my area so I can't really speak to it. >>>>> >>>>> I may try out a larger front tire soon and will happily report back. >>>>> I don't think I'm going to try a larger rear tire for the reasons above >>>>> re: >>>>> chainline. >>>>> >>>>> And thanks for the nod on the build! Happy with all the shiny bits. >>>>> >>>>> Erik >>>>> >>>>>> >>>>>> >>>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "RBW Owners Bunch" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> >>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/rbw-owners-bunch/d8ca52d4-a8b3-499f-bea6-a3ca85fd1eabn%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/d8ca52d4-a8b3-499f-bea6-a3ca85fd1eabn%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> >>>> >>>> -- >>>> >>>> ----------------------------------------------------------------------- >>>> Patrick Moore >>>> Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum >>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "RBW Owners Bunch" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> >> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/rbw-owners-bunch/4c084692-104a-48c1-83c9-d87dff482caen%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/rbw-owners-bunch/4c084692-104a-48c1-83c9-d87dff482caen%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> >> ----------------------------------------------------------------------- >> Patrick Moore >> Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum >> >> -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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