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CRANK PULLEYS

    UR = The first power pulleys for American, Asian & European sport compacts.
    UR = The lightest pulleys for the biggest HP gains and the most gas savings.
    UR = The leader in HP increase per dollar.
    UR = CAD designed & CNC machined in the U.S.
    UR = The best balance, no wobbling, hopping and they fit right the first time.
    UR = The finest finish, ready for anodizing or plating of any kind.
    UR = The most comprehensive warranty (5 years) for peace of mind.
    UR = The widest range of applications.
    UR = The best technical and customer service.
    UR = 14+ years of "real world" use from street to strip to rally to road course.

    UNDERDRIVE

    Our most popular crank pulleys, they increase performance by reducing the engines spinning weight and also because they underdrive all the accessories (a/c, alternator, p/s & w/p). We are very careful not to overdue the amount of underdrive for two main reasons. We do this to maximize the weight loss on the crankshaft where most of the horsepower gains are realized. We are very careful not to overdue the amount of underdrive very little horsepower is gained from extreme underdriving over 20%. We always keep our underdrive percentage under 20% allowing us to maintain factory specified outputs for the accessories (a/c, alternator, power steering & water pump). Our designs allow you to upgrade your stereo to a system of up to 600 watts (RMS) and not have any charging problems. Underdriving gives you 10-15% more power than our stock diameter pulley sets (See below).

    UNDERDRIVE - SINGLE BELT CONVERSION

    Some customers wanted a pulley to eleminate extra belt sections. These single belt pulleys take weight loss to the next level. These pulleys give the biggest power gains of all our pulleys. These pulleys are only available for Honda B, D, F & H Series engines. These pulleys allow pulley to frame clearanceFo for many motors swaps. The single belt drives the alternator on B & D-Series and the alternator & A/C on F & H-Series. So if you want to maximize your engines weight loss these pulleys are your first and only choice. Any of our alternator pulleys can be used with single belt conversion.

    STOCK DIAMETER

    Some customers asked for crank pulleys without underdrive. They want to keep the stock speed for their alternators, superchargers and water pumps. UR developed this version because the performance benefits of weight reduction outweigh the need for underdrive, especially for audio enthusiasts as some audio competitions require voltage to remain at a specific level. Stock diameter is also important for factory or aftermarket superchargers. Superchargers need the stock diameter to keep the same boost you had with the factory crank pulley. The big weight loss gets you a lot more power to the wheels.

    When you want the best crank pulleys money can buy don't settle for a cheap time bomb go with