Alternate Parts / Source - Radical Sportscar Registry Forum

Single seat for SR3 year 2007

Manuel Rey — Tue, 31 Mar 2026 11:35:25 +0000

Hello guys! I am looking for a single seat for my Radical SR3, i have the factory two seat, but it is really annoying when i turn right and my elbow hits the center part of the seat. For what i saw, there are factory single seats, or in last option, another factory two seat to buy. Thank you guys

SR3 driveshafts

Josh Spray — Sat, 28 Mar 2026 21:55:21 +0000

Hey guys,

What details do we know about the SR3 driveshafts? Particulary the right side longer one. I need to re-build it from my mishap last year and the shaft is cocked and locked sideways in the CV joint so I am thinking something will need to be replaced.

Need help to identify this floating discs and Bell + cross reference

Nicolas ch — Mon, 19 Jan 2026 18:20:12 +0000

Hello I own a SR3 earlier models. on the front I assume they converted to 280 mm discs. But now the bells are damaged and the discs are mooving too much.

What is the tolerance of "jeu" ? i can insert a 1.3 mm gauge to stop the disc mooving.

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3 solutions:

-find a pair of bells but Im not sure its a radical disc I have ?

-retrofit to standard 280mm discs but do I need floating calipers ? and witch disc (from usual car) use 280mm discs that would fit ?

-buy new discs and bells and sale my wife's car to pay ! 🤣

thanks for helping me !

Wheel Nut Sockets - NO MORE ADAPTERS!!

GroupARacing — Mon, 12 Jan 2026 22:25:29 +0000

Hi All,

We have worked with a machine shop to develop a custom wheel nut socket for Radical race cars. Tested with all the dealer teams in Radical Cup North America 2025 to become the socket of choice, we are now making available for the general public.

- No longer need an adapter for clearance to the wheel

- Much tighter fit and does not come off the torque wrench or gun

- Set screw added to further secure the socket to the torque wrench or gun, with this also eliminate wheel nuts and sockets flying off and rolling around everywhere.

- Much tighter fit to the wheel nut to help eliminate rounding wheel nuts, wheel nuts flying off etc. One picture attached shows how the wheel nut can not come out of the socket on its own.

- Available in both 1/2" Drive & 3/4" Drive.

They are $170 per. If they order atleast 2 at one time get them for $165 per.

GroupARacing AT AOL.com 631-974-4379

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Source for shift button cover

Bryan Tatum — Tue, 16 Sep 2025 20:07:10 +0000

Title kind of says it all - the rubber waterproof boot cover tore and fell off of the shift button on the steering wheel. Anyone found a source for these? I bet Amazon has something but I am not sure of the size / threadcount.

Thanks!

SR3 Rear Brake Lights source

Mick McMillan — Wed, 13 Aug 2025 05:56:55 +0000

Has anyone found an alternative source for SR3 Rear Brake lights? Presuming they are off another type of vehicle to start with?

SR3 RS brake piston seal sizes

Bryan Tatum — Tue, 12 Aug 2025 18:44:15 +0000

I cooked my rear brake piston seals this weekend (long story) and am going to R&R the system at all 4 corners. Has anyone found alternate source for the 16 piston seals? I know they are 2 different sizes but am looking for size / source / part numbers if you have been able to find them somewhere other than a Radical dealer.

Thx,

Bryan

First Gen SR3 Wilwood brake pads

Chris Larson — Mon, 28 Jul 2025 00:23:01 +0000

Looking for a part number(s) to order new brake pads for a first gen Radical SR3. This is chassis number 71 with Wilwood calipers and non-floating rotors. Any help would be greatly appreciated!!

SR8 Master cylinder

Josh Broome — Fri, 14 Mar 2025 10:35:07 +0000

Hi I need to buy the 3 master cylinders for a 2006 SR8 but unfortunately can’t find one locally as none of the race parts supplies have. Are there any options for generic ones?

Air box couplers thingamabobs

Josh Spray — Tue, 05 Nov 2024 15:46:06 +0000

I am looking to buy a replacment set of these as mine are fairly hard and like to not stay on once clamped.

Can anyone give a suggestion on where to order them from? Please dont say a dealer lol

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