ledslinger
Thread starter
Unfortunately I destroyed one of the new 4000s tires with 50 miles on it tonight. My rims aren't hook bead and this along with a too wide rim strip that impeded on the raised area that retains the bead. I don't think it would have failed with the correct rim strip, but the guy who assisted me at the bike shop assured me they use them on everything. My gut told me it wasn't right, but I deferred to his experience. It failed at the stem where the butyl rim strip was double thickness, further blocking bead seating. A not too cheap lesson.
The tire blew on a flat straight and I hit both brakes to slow quickly to limit the revolutions on the flat tire. I think I may have skidded the rim on the sidewall, perforating it. When a bike tire blows out from a bead unseating, the deflation is immediate and the flat tire offers no support. The sidewall of the tire with the bead still seated takes the entire weight and gets damaged very quickly.
20/20 hindsight, correct width rim strip would have probably prevented the bead unseating. If you have a blowout on the back, don't use rear brake.
The tire blew on a flat straight and I hit both brakes to slow quickly to limit the revolutions on the flat tire. I think I may have skidded the rim on the sidewall, perforating it. When a bike tire blows out from a bead unseating, the deflation is immediate and the flat tire offers no support. The sidewall of the tire with the bead still seated takes the entire weight and gets damaged very quickly.
20/20 hindsight, correct width rim strip would have probably prevented the bead unseating. If you have a blowout on the back, don't use rear brake.