Racing Classes
NEW FOR 2025:
ACU Thunderbike 500
Supported by: Fyne Audio & SF Parts
Since our announcement of a grid for CB500s there’s been significant interest. So we propose to run 3 x sub-classes here: Sub 75kg, sub 95KG & over 95KG. This class will have an exclusive grid. There will also be a Rookie Championship bridging across all three sub-classes.
The overall ACU Championship for this class will be based on the first 3 over the line - irrespective of sub-class
Regulations are published HERE
BMZRC 250 MZ
The ultimate budget class with a great family friendly paddock. This class may use any tyre treaded or slick and is run in accordance with the BMZRC technical specifications. Much more info on the MZ Racing Club’s own site at www.bmzrc.net
Runs with TGJC/Senior Ninjas........
BMCRC Formula 400
The F400 class has developed into a superbly competitive class with great camaraderie. Regulations are HERE
This class will run as a separate championship within the Thunderbike Sport Grid
RKB-F1/BMCRC F1 & F2 Sidecars
If 3-wheels take your fancy and there’re two of you we’ll put you in touch with reps from this class who can help you get started. A unique breed of racers this and the Bemsee paddock is more the richer for them. With National and World competitions converting to 600cc engines throughout, we will maintain the availability of a max 1000cc F1 Long Chassis class Championship for 2025 alongside a short chassis 600 F2 class.
DART MRO 600 & Clubman 600 & Moto EVO and Street EVO
A class that mixes Stock 600’s and Supersport 600 tuned machines competing for a single title.
Features a “600 Clubman Championship” open to Clubmen licence holders only, stock or tuned.
Clubman do not score in the main Championship. Meeting Format: MRO 600 runs one qualifying session to set the grid for race 1.
The Class has voted to have three races over the weekend. Here the first race (on Saturday at most events) Will be a longer length race compared with other classes the second day of racing being the standard 2-race format. Subsequent races grids set according to fastest lap scored in previous race.
Moto EVO and Street EVO - Continues for 2025
MRO Minitwins
Supported by Properly Protected Insurance
The biggest dedicated Minitwin grid in the UK! Predominantly the Suzuki SV650. 16 yr olds
Can be on an ACU Novice or Clubman Licence, 15yrs on a National Licence.
Rookies will run in with the main MRO Class
This class must use Road Legal tyres except when a wet race has been declared.
Regulations are HERE
BMCRC SuperTwins
Runs in with Thunderbike Sport as a separate class, started in 2023 and continues with support from TW Suspension
Any four-stroke twin cylinder motorcycle available for purchase to the general public for road use with a water-cooled engine of up to 800cc may be used (see details for rules in Downloads section)
SuperTwins - continues in 2025 - Regulations HERE
Reactive Parts MRO Powerbikes
& MRO Clubman 1000
Open to all 1000cc bikes, Stock or Tuned competing for a single title.
Features a “1000cc Clubman Cup” open to Clubmen licence holders only, stock or tuned.
Meeting Format: runs one qualifying session to set the grid for race 1.
The Class has four races over the weekend. Subsequent races grids set according to fastest lap scored in previous race.
AND CONTINUING FOR 2025: MRO RETRO 1000
For older 1000s:
Yamaha R1 – Up to 2014
Honda Fireblade – Up to 2016
Kawasaki ZX-10 – Up to 2010
Suzuki GSXR-1000 – Up to 2016
These are all ‘Pre Electronic’ so no riders aids like traction, Launch and anti-Wheelie control.
Separate Championship - does not score in Powerbike or C1000 series in 2025
ACU Team Green Junior Cup/Senior Ninja Series
Series for 13-18 yr olds on the Kawasaki Ninja 300 or 400 twin, 4-stroke.
Special Ninja 400 package available via Kawasaki, sealed engines, over 9 rounds. Novice, Clubman or National licence holders’ eligible.
Dunlop controlled tyre. Ninja 250’s from 2012/3 also eligible, some available second hand….
Interested riders/parents teams should email the Bemsee office ( mikedommett@hotmail.com ) to register interest in order to receive a 2025 Series information pack.
CONTINUED FOR 2025: Senior Ninja Series
So many riders (and Dads) said they’d love to race the kid’s 300 or 400 bike – now’s your chance
Identical package to the Juniors, buy a bike and race! Will run alongside the Junior grid.
Contact mikedommett@hotmail.com to get things moving.
L&W Contractors BMCRC Rookie 600s & Rookie 1000s
This class is where many start their careers. All riders will be first year novice licence holders. The bikes run to Supersport/Superstock rules, this means you can run a tuned or stock bike. It’s trackcraft you’ll be learning as in the hands of a talented rider any bike can go quick. You’ll have the option to use treaded or slick tyres. There are separate Rookie 600 and Rookie 1000 championships running in the same grid.
BMCRC Thunderbike Sport & Thunderbike Extreme & Thunderbike Ultra
Supported by The Clothing Kings, Steve Jordan Motorcycles & TBR Performance
The only Power to Weight Ratio series in the UK…
A power to weight ratio restriction applies here covering Singles, twins, triples & fours which are all eligible for this class. You may use any tyre, treaded or slick. Technical Regs for 2025 are below. This class includes a Thunderbike Extreme section too with a slightly higher P-W ratio. Details here.....
Ultra & Extreme run on the same grid - Sport is separate with Bemsee SuperTwins
Thunderbike Regulations and the Thunderbikes - Eligible Bikes List can be found in this section
DFDS Seaways Yamaha Past Masters
Budget racing on the great Yamaha LC, TZR and YPVS bikes of the 80’s and early 90’s. The YPM class has developed into a special group in the Bemsee paddock. This class uses treaded tyres. Trophies for Clubman riders on all races.
