I'm trying to setup webforms routing in umbraco.

I have a content page off the route called "ride".  I'd like to change it from www.mysite.com/ride?id=12345 to www.mysite.com/ride/12345

I've added the following to a class in the app code folder.

public class Global : umbraco.Global
{

    /// <summary>
    /// Code that runs on application startup
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>

    protected override void Application_Start(object sender, EventArgs e)
    {
        base.Application_Start(sender, e);

        RouteTable.Routes.Add("RideRoute", 
                                new Route("ride/{RideGuid}", 
                                new PageRouteHandler("~/ride")));

    }

But that gives me a 404.

I've also tried adding ~/ride/ to umbracoReservedUrls umbracoReservedPaths in the web.config

Does anyone know how to get this to work?