Expect to do a lot of climbing at the Dedham Trails. There is a gravel road leading to the top and numerous singletracks leading off of it. Many of these are rocky or challenging. Sone have wooden ramps over damp areas. You will probably have to get off your bike occasionally, unless you are a very experienced ride. But, don't let this description turn you off. Dedham is a lot of fun and the views from the top are memorable.
From the intersection of 1A and 46 in Holden
Head southeast on U.S. 1A E for 4.3 miles
Turn in will be on the left, there is a gate and small parking lot
***Note for those driving eastbound: During busy hours drive past the trailhead and turn around at the end of Lily Road (next road on the right) so you can turn right into the trailhead. Taking a left while stopped in the middle of the road is almost always a tense moment as folks drive very fast coming down the road.