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Caterham Mirror FAQ

DPR Mirror Options for Caterham Sports Cars
  • Eccles mounts to reduce vibration when fixed to doors
  • Pillar mounts to fit to the windscreen stanchions
  • Roll cage mounts to fit to a 32mm diameter roll cage
  • Conversion kit to use the "Spa Black Nut" with the "Two-Hole" base

1. Standard Door Mounts

Pros: Allow the door to open fully (180 degrees), significantly improving access and egress. This is beneficial for daily use.

Cons: But highly prone to vibration because the door itself is a flexible, removable panel,  leading to a blurred image at high RPM or speed.

Best For: Road use where ease of getting in and out is essential.

1.b. Eccles Style Mounts

Eccles Style Mounts are the optimal solution for eliminating the vibration issue associated with door mounting while retaining the door's full range of motion.

Benefit: These rigid brackets minimise vibration.

Reason: The mount replaces one of the door's standard hinges. This moves the mirror's anchor point from the flexible door skin to a solid, structural connection to the body tub, which drastically reduces shake and wobble, providing a stable platform for the mirror head.

Specifics: DPR supplied Eccles mounts are made of billet aluminium and have the Spa black nut fixing integrated into the design. Furthermore, your purchase includes a donation of £2.50 to the Caterham & Lotus Club where the design originated.

Purchase Links: DPR Motorsport (Eccles Mounts).

2. Windscreen Stanchion Mounts

Pros: Provide the most stable, vibration-free image because the stanchion is rigidly fixed to the chassis. Excellent for maintaining clear vision at speed.

Cons: The mirror position limits how far the door can open, that can make entry and exit difficult for occupants. Additionally, when the full side-screens are in place, the mirror on the left-hand (passenger) side can have a compromised view.

Best For: Road use where image clarity and stability is the highest priority.

Purchase Links: DPR Motorsport (Pillar Mounts).

3. Aero Screen / Scuttle Mounts

Pros: Offer the lowest drag and a minimalist, race-inspired aesthetic.

Cons: Not optimal for road use..

Best For: Track days or owners who prioritize aerodynamics thorough eliminating the standard windscreen rather than practicalities. Fitting a DPR black nut conversion kit enables easier and more reliable mirror adjustment.

4. Roll Cage Mounts (Race Cars Only)

Pros: Provide ultimate stability and the lowest drag from the smallest possible mirror heads.

Cons: Requires a full safety cage.

Best For: Dedicated race cars and competition.

Purchase Links: DPR Motorsport (Roll Cage Slimline Mirror Clamp - 32mm).

II. Aftermarket Mirror Units

After-market mirrors with specific features are necessary to maximize the benefits of any mount.  Spa mirrors provide a l;ong established race=proven solution.

Convex Glass: This is the most important upgrade. Using convex (curved) glass provides a much wider field of view than standard flat mirrors, compensating for the small size of the unit.

Lightweight Housing: These smaller mirrors have less surface area which directly reduces vibration and aerodynamic drag. Both the standard Spa FIA mirror (113 mm x 52 mm) and the larger Spa GT mirror (148 mm x 68 mm) are available from DPR Motorsport. Most customers are satisfied with both the look and performance of the smaller Spa FIA mirror, but the larger-sized GT mirror may suit those who want to maximise viewing area and are less concerned over the look/air resistance.

Purchase Links: DPR Motorsport (Mirrors and Accessories).

III. SPA Black Nut Fixing vs. Standard Base

The SPA Formula mirror is the most popular choice, but its standard two-hole base uses an internal screw (grub screw) to lock the mirror head's position. The "black nut" fixing solves the resulting usability issues.

Standard Spa Two-Hole Base Issue: To adjust and secure the mirror head, the internal locking bolt must be accessed from underneath or behind the mounting base, making on-the-fly adjustment frustrating.

Black Nut Benefit: The "black nut" (a conical adjusting nut) is an external part of the mirror's mounting stem. It allows the mirror head to be adjusted and locked externally without disassembling the mirror or reaching through the bodywork.

Conversion Kit: DPR offers a conversion kit that allows the superior SPA Black Nut fixing to be used in conjunction with the standard two-hole base mounting, providing ease of adjustment without needing a completely different mounting system.

Purchase Links: DPR Motorsport (Black Nut Conversion Kit).

IV. Ideal Road Compromise

The best all-around solution for a road-going Caterham is an Eccles Style Mount combined with a high-quality, lightweight Spa convex irror with the Black Nut fixing. This setup successfully offers the best balance of full door access and reduced mirror vibration. For those who want the option to run with and without doors, fitting the DPR pillar mounts allows mirrors to be easily switched between the two solutions.

DPR "Eccles" Mounts

The DPR version of the "Eccles" mount is now available in a LH and RH fitting complete with a DPR logo. Immensely strong and robust due being CNC machined from aluminium and finished in black anodising. This mount comes complete with the Caterham hinge fixing pin and the proven DPR pillar fixing that allows a Spa mirror to be fitted using the Spa "Black Nut" that completes the supplied part.

In recognition of the original source of the design, each pair of mounts sold will result in a donation of £2.50 to the Caterham and Lotus Seven Club.

 

 

 

 

 

The DPR "Eccles" type mount is supplied with the Spa black nut fixing - a DPR pillar mount and Spa black nut - so a Spa mirror can be easily attached.

The mounts are supplied with a LH & RH side and come complete with the Caterham brass pin to simply replace the plastic hinge pin using the existing Caterham fixings.


Our mounts are completely flat on the reverse so fit tight against the door. Unlike other solutions, mirror adjustment only requires access from the mirror side using a suitable sized spanner.

 

Purchase Links: DPR Motorsport (Eccles Mounts).

DPR Caterham Accessories


Caterham Side Intrusion Bar - Chassis Boss Cover (Pair) - Black Anodised

Supplied as a set of two this newly designed part covers the rather ugly hole on the boss for mounting a side intrusion bar on a Caterham chassis.

Manufactured in black anodised aluminium this boss cover ensures a finished appearance and  also prevents the inevitable rusting that occurs to the internal thread when left open to the elements.  The black anodised finish matches the Caterham powder coat and the knurled surround improves the aesthetics as well as enabling the part to be screwed in place.

Purchase Links: DPR Motorsport (Caterham SIB Chassis Boss Covers - Set of Two)

SV Throttle Pedal Extender

Does what it says on the tin! - Improves heel & toe in the wider pedal box of the SV chassis.

Note: This part is designed to fit the more recent metric chassis. Some modification may be required to fit this part to an Imperial chassis SV

Purchase Links: DPR Motorsport (SV Throttle Pedal Extender)

Single Spa Mirror Black Nut Conversion Kit

This conversion kit improves the mirror adjustment where a  "Eccles" mount, not supplied by DPR, is using the standard Spa two hole base to attach the mirror.  This conversion kit is also relevant where the Spa mirror is fixed directly to the bodywork or aero-screen using the two-hole base.  

This kit provides a significant usability gain by enabling the mirror alignment to be adjusted using the Spa black nut,  without requiring access from underneath the standard two hole base. 

Purchase Links: DPR Motorsport (Single Spa Mirror Black Nut Conversion Kit)

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