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Product Line: pro
Ground Conditions: Hardpack, Gravel
Type: folding tyre
Tubeless System: HTLR
Rubber Compound: natural rubber
Carcass: 260 tpi, SuperPoly
Puncture Protection: PPS2
Dimensions: 700 x 33c
Air Pressure (max.): 7 bar
Recommended air pressure: 2.5 - 4 bar
Compatible inner rim width: 17 - 25 mm
Manufacturer Number: 00526
Tyres marked as Tubeless Ready (TLR) can be used with or without a tube. A sealant must be used for tubeless mounting. Challenge tyres should not be mounted on wheels that do not meet ETRTO and ISO standards. Non-compliant wheels could cut through the sidewall above the bead, causing the tyre to burst and possibly injuring the rider.
- handmade, with aramid bead
- more control in curves compared to Strada Bianca
- lower rolling resistance than the Gravel Grinder
- black tread with brown flank
Handmade tires combine essential characteristics such as natural materials, ultra-fine carcasses and a flat, flexible shape to achieve top values in comfort and rolling efficiency.
Natural rubber - Smart hardness grade
Tyres made of natural rubber score particularly well in terms of performance, comfort and control and boast a notably long service life. They are available in various degrees of hardness, where " Smart" translates to a rather firm profile that improves durability and rolling efficiency.
The SuperPoly carcass is made of polyester, which is characterised by its durability and waterproof aspects, while at the same possessing remarkable flexibility. The TPI number is significantly higher than for other carcasses, so the material is finer and therefore more flexible.
The Puncture Protection Strip (PPS) is a special material layer between the tread and carcass of a tyre to increase its puncture resistance. In PPS2 tyres designed for natural paths and cobblestones, there is an additional layer of fabric under the carcass for extra protection (slightly thicker in tubeless tyres), as well as a bead-to-wall ply that retains air in tubeless tyres.
HTLR (Handmade Tubeless Ready)
Handmade TLR tyres are made from the same materials and using the same processes as Challenge's handmade tubular tyres, except that no inner tube is incorporated. The carcass is wrapped around an aramid bead so that the tyre can be mounted on a clincher rim. The advantage of HTLR tyres lies in their flat shape, which allows a natural deformation of the carcass on uneven ground and a lower rolling resistance. A tubeless set-up with sealant maintains the signature suppleness of handmade Challenge tyres.
- 1 x Challenge Almanzo Pro Handmade TLR 28" folding tyre