Here is a list of some trails that I know of in Guelph.
If you know of any more please e-mail me. Thanks.

 

Name Guelph Lake Conservation Area - run by Guelph Off Road Bicycling Association (GORBA)
Location starts on Victoria Road North at the end of the Speed River Trail
Terrain the main path is mostly stone but the side paths are dirt
Length 30-60 min
Difficulty take the single path side trails if you want a more difficult ride, just make sure it is a real trail first!
Map  
Picture  

 

Name  
Location Between Arkell and Stone Rd. close to the river
Terrain Hills, rock, open and closed forest, a pond with a dam with leads to another trail
Length 30 min
Difficulty Average, more difficult if you ride faster through the forest
Map  
Picture  

 

Name Downtown Trail
Location Along Speed River from York to Speedvale
Terrain Gravel / Crushed stone, but I am not sure if it is completed
Length 0.75km in Heritage Park, 3.6km total proposed trail length
Difficulty  
Map Open the map (need Adobe Reader)
Picture  

 

Name Eramosa River Trail
Location Connects at the Downtown Trail (the Covered Bridge) and follows the Eramosa River to Victoria or you can continue until you get to Stone Road across from the Barber Scout Camp
Terrain Crushed stone, in and around forest
Length 4.1 km total length, 2.3 km from the Covered Bridge to Victoria Road, 1.8 km from Victoria Road to Stone Road (across from the Barber Scout Camp)
Difficulty  
Map Open the map (need Adobe Reader)
Picture  

 

Name Silvercreek Trail
Location Connects the Downtown Trail (at Gordon Street, the Covered Bridge) to the Hanlon Creek Trail
Terrain Crushed stone 
Length 4.9 km
Difficulty Average
Map Open the map (need Adobe Reader)
Picture  

 

Name Hanlon Creek Trail 
Location Connects from the Silvercreek trail to Preservation Park
Terrain Crushed stone, some of the park between Stone Rd. and Kortright is paved
Length 3.1 km total length, 
Difficulty  
Map Open the map (need Adobe Reader)
Picture  

 

Name Speed River Trail 
Location Connects from the Downtown trail to a trail which leads to Guelph Lake
Terrain Riverside Park is crushed stone, but after that the trail is in the forest
Length 3.4 km total length
Difficulty  
Map Open the map (need Adobe Reader)
Picture  

 

Name CNR Spur Line Trail 
Location Off of the Incomplete Downtown Trail, travels trough Exhibition Park
Terrain  
Length 1.6 km total length, 
Difficulty  
Map Open the map (need Adobe Reader)
Picture