Goodyear Rubber Products




Syncrochain Belts

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Carbon makes the difference! Higher power capacity, longer service lives and hardly any initial tension loss. With a newly developed carbon tension member at its heart, Conti® Synchrochain Carbon is launching itself into the leading position among the world’s highest-performance timing belts.
The ContiTech Power Transmission Group is a developer, manufacturer and supplier of power transmission belts, components and complete belt drive systems. The company is once again demonstrating its market- and customer-focused expertise, this time with the new Conti® Synchrochain Carbon. The new polyurethane heavy-duty timing belt with a carbon tension member offers several advantages over other timing belts.

Conti® Synchrochain Carbon can transmit up to 5 times more power than conventional timing belts with the same overall width. Belt width can be reduced by up to 80%. This means overall system costs can be reduced by using Conti® Synchrochain Carbon.

The great stiffness of the cord in Conti® Synchrochain Carbon means initial tension loss is cut almost to zero. Over the lifetime of the belt, this represents a further enhancement in drive efficiency.Conti® Synchrochain Carbon is extremely wear-resistant, abrasionresistant and maintenance-free. Service life is increased by up to 100% compared with competitive heavy-duty timing belts.Elongation of the high-tensile carbon tension member is 50% lower compared with aramid. This makes Conti® Synchrochain Carbon suitable for maximum torque and offers longitudinally stable operation over its entire lifetime.

Conti® Synchrochain Carbon

Intelligent Design for Maximum Output.

Light but durable polyurethane for teeth and backing. High-tensile and, at the same time, longitudinally stable carbon for the tension member. Plus a specially coated, wear-resistant face fabric. The intelligent design in combination with especially high-quality materials, is a defining features of Conti® Synchrochain Carbon. It ensures clean, smooth and particularly reliable power transmission both at high torques or dynamic loads.


  • Temperature range, depending on application, from -67°F to +176°F (-55°C to +80°C). For temperatures lower than -40°F, please contact ContiTech)
  • Suitable for tropical climates
  • Resistant to aging and ozone
  • Withstands reverse flexing
  • Resistant to oils, grease and fuel
  • Conditionally resistant to acid and lye
  • Raw materials and production are silicone-free
  • Maintenance-free
  • Belt speeds up to 7800 f/m
  • Increased power output
  • Longitudinally stable throughout its lifetime

The newly developed CTD profile (CTD: Conti Torque Drive) is the symbiosis of the HTD and the STD profile and combines the advantages of both in a single profile. The arch-shaped pulleyentry geometry, on the one hand, and the higher tooth, on the other, provide harmonic tooth meshing and therefore ultra smooth running. At the same time, it provides excellent protection against belt slip at high torque.

Inside tensioning pulleys

Inside tensioning pulleys are to be preferred to outside tensioning pulleys as they do not cause any unfavorable alternate bending. The inside tensioning pulley is invariably toothed and is to be positioned on the slack side as close as possible to the large pulley, so as not to unnecessarily reduce the arc of contact on the small pulley. The number of teeth of an inside tensioning pulley should at least equal the smallest possible section-related number of teeth. Plain inside tensioning pulleys may be used when the outside diameter < 2.5 – 3.0 times larger than the smallest permissible number of teeth of the selected section.

Outside tensioning pulley

Outside tensioning pulleys cause the drive belt to counterflex with an increase in the number of meshing teeth. The diameter of plain outside tensioning pulleys should be at least 1.5 times the diameter of the smallest pulley. Outside tensioning pulleys should in principle be positioned close to the small pulley.

Tooth Pitch(t) 5.6 10.0
Tooth height (ht) 360 410
Min. number of teeth (zmin) 22 28
min pitch diameter of the small toothed pulley dw [mm] 56.02 124.78
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