Heidenau K37 SW M+S SiO2 4.00-19 71P RF TT Sidecar

Heidenau K37 SW M+S SiO2 4.00-19 71P is the winter version of the K37 SW sidecar tyre, with a Silica compound made for the cold below +7 °C. The reinforced carcass and square profile for heavy sidecars stay in place, while the rubber and the M+S marking are now built for snow, slush and cold wet tarmac. The tread is the same classic block pattern as the summer K37 SW.

What K37 SW M+S gives you

• Stays supple in the frost: Where a standard K37 SW starts to go hard and slide, the Silica winter compound of Heidenau K37 SW M+S stays soft and keeps working.
• Digs through snow: The big, widely-spaced blocks of K37 SW M+S bite into snow and slush and resist polishing over on packed surfaces.
• Carries the load in winter: The reinforced (RF) carcass and square profile of K37 SW M+S hold a loaded sidecar — like the summer version, only in the cold.
• Cold and wet: The M+S marking and the Silica compound work for grip where an ordinary tyre is already swimming through a cold puddle.

Rubber and carcass

Heidenau K37 SW M+S SiO2 uses a bias-ply construction in tube-type (TT) form, with a reinforced carcass and the M+S marking. The block tread clears slush, while the Silica compound handles grip in the frost and on wet surfaces. It is the pairing of a winter compound and a reinforced sidecar carcass that keeps K37 SW M+S pulling where a summer sidecar tyre has already given up — at and below around +7 °C.

Who this tyre is for, and when

Heidenau K37 SW M+S SiO2 is for the cold season on a sidecar rig: frost, snow, slush and icy drizzle. If it stays above +7 °C, the summer Heidenau K37 SW 4.00-19 is the better buy — it lasts longer on warm tarmac. And to be straight: M+S means it is rated for mud and snow, but it is not studded and is no cure on black ice. On sheet ice any friction tyre is powerless.

Who it suits

Heidenau K37 SW M+S SiO2 4.00-19 is a working winter tyre for a sidecar: town and motorway while the cold lasts. Choose your size and order with delivery across Kazakhstan — the full range of Heidenau winter motorcycle tyres is here.