Brett Harte and Doug McIntosh were the only two B grade riders to crack the coveted 40km/h average mark with Harte recording 36m13s at 41.4km/h to beat McIntosh by 55s.
Kerri-Anne Page was another 38s in arrears in third place.
Less than 25 seconds separated the top three finishers in C grade, with Craig Hill achieving a time of 39m03s to finish 13s ahead of Steve Nicholls, with Richard Gray another 10s back in third place.
Tandem pairings rode to victory in the D and F grades.
Mark Todd and Pauline Summers finished in 39m17s to finish 32s ahead of Laura Harris in D grade while the F grade victory of Brian and Roxanne Kelly was much more clearcut with a 1m42s margin over Ann Robottom. The Kelly pairing were probably spurred on by their 13-year-old grandson Nicholas Kelly, who rode impressively for third place at an average speed of 32.3km/h as opposed to a 24.6km/h average he achieved back in January.
Only eight riders registered in E grade with Stu McKie recording the fastest time of 43m29s. Dave Marett was 36s slower in second place.
The G grade field acquitted themselves well to the task with all riders averaging over 25km/h. Janice Kennerley recorded 28.9km/h for first place, Teresa White finished second in 28.3km/h and Sophie Chote secured third place with a 28.1km/h average speed.
The Spring Series continues on Saturday with graded racing from Haumoana School on the Kahuranaki Rd out and return course.