Here is what I can calculate from memory for the switch for my 29er wheels; I realize that Leah uses 650B, so adjust accordingly.
700C X 60 Big Apple, the "Liteskin" version: 800 grams on my scale. Box-stock 29er tube: 250 grams. Total: 1050 grams. 700C X 60 Big One: 450 grams on my scale. 2 fl oz sealant: 60 grams. Total: 510 grams. 1050 - 510 = 540 grams, which is ~1.2 lb, and that's for 1 wheel; 2.4 for both. So perhaps Leah's calculation is accurate. I also swapped out the very nice 2" wide Snocat (also "Extralights!) at 800 grams each even with big holes drilled in them for Velocity Blunt SS's at a claimed 435 grams each; let's say 500 grams. That's another 300 per wheel or 600 total, 1.5 lb, for a grand total of 3.9 lb saved on both wheels. Actually, I originally saved another 0.4 lb -- 4.3 lb total -- because I first installed 700C X 50 Furious Freds at 360 grams each. On Sun, Jun 7, 2020 at 4:57 PM ted <ted.ke...@comcast.net> wrote: > Depending on the size tires you ride, replacing your tubes with sealant > can save a few ounces but 1.5 pounds seems implausible. > > 1.5 pounds is 24 oz. add 3 for sealant (mind i think that 2-4 oz. is per > wheel so I should add 6) and you get 27 so your tubes were over 13oz. each? > That's about 370gr per tube. > A standard Schwalbe tube for 700c 40-62mm tires is only 220gr, the > superlight one is 140gr. (ref: > https://www.renehersecycles.com/shop/components/tires/700c/schwalbe-tubes-for-700c-tires/ > ) > Coming at it a different way, the 2-4 ounces is per wheel, that's 85 gr > plus or minus, a schwalbe tube for a big tire is 140 or 220 gr. So > replacing tubes with sealant should save something like 135gr per wheel for > regular tubes, 55gr for light ones. That's 0.12 to 0.30 lb per wheel, or > .24 to .6 pounds combined. > Something is not adding up here. > Also remember in about 6 months you'll add another ~2oz of sealant to each > wheel. That's adding about 1/4 pound to your bike. > > I suspect most of your 1.5 pounds is lighter tires. I'd be very surprised > if replacing the sealant in your tires with tubes would add 1.5 pounds to > your new wheels. And in 6 months (if you haven't worn out your tires you'll > be adding) 0.25 pounds to refresh the sealant. > I am all for trimming fat off a bike. I'm also in favor of being accurate > about where the fat is coming from. > > Of course it is perfectly reasonable to not care where the lbs come from, > hey your bike is now lighter, YAY. > > To try and lighten the mood after raining on the parade I offer: > Your on the road repair kit for tubeless may well be lighter than what you > would carry for tubes. So that makes your bike even lighter. > Bonus fun, those beautiful colored spoke nipples are Al instead of the > typical brass, so not only do they look great they are lighter too. > > On Sunday, June 7, 2020 at 2:05:46 PM UTC-7, Bicycle Belle Ding Ding! > wrote: >> >> Well, the other thing the #RivSisters wanted was less weight. Tubes are >> heavier than sealant - the sealant was only 2-4 ounces. If I remember >> right, I got rid of 1.5 pounds by shedding tubes. That said, none of us >> women are weight weenies - we’re choosing stout Rivendell bikes as our >> daily riders after all, but if we can trim some of the fat to make the >> bikes more maneuverable, we do. >> >> Sent from my iPad >> >> > On Jun 7, 2020, at 1:57 PM, ted <ted....@comcast.net> wrote: >> > >> > -- > 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 rbw-owners-bunch+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rbw-owners-bunch/30821e92-b885-4b2d-aa25-b6c1a2944684o%40googlegroups.com > <https://groups.google.com/d/msgid/rbw-owners-bunch/30821e92-b885-4b2d-aa25-b6c1a2944684o%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 rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfguMM38hSfd0gG-edX69EB9uaMDy8op%2B7fWOELdogfbS2w%40mail.gmail.com.
