As a British engineering company, Hi Spec Motorsport Ltd

manufactures conversions, calipers and rotors at our premises in Dartford, Kent.

With over 25 years of experience making brake components, Hi Spec Motorsport Ltd can manufacture conversions for many vehicles.

Recommended brake conversions as per wheel size below:

Please request wheel clearance diagram to be absolutely sure our brake conversion will clear your wheels!

Please select options below and add to cart to view cost of brake conversion.

Hi Spec entire range of calipers are made from highest quality billet aluminium.

Hi Spec’s caliper are made to extreme specifications and tolerances.

Hi Spec road calipers are designed, tested and proven to be used on race cars.

Hi Spec road calipers are available in hard anodised black for function or powdercoat red, yellow, blue, black or silver.

Hi Spec road calipers (except our Ultralite range) come equipped with dust boots to keep dust, dirt and grime away from the piston seals.

18” Front Road Brake Conversions

2 piece disc brake conversion contents example picture.

Billet 4 - Brake Conversions

Our Billet 4 brake conversions are great value for money and the calipers are immensely popular due to this fact. They offer great performance on light vehicles that are not running too much power and used on the road.

Please check out our Billet 4 calipers in the caliper section for more information.

Monster Brake Conversions

Monster calipers look stunning as well being pretty robust. They are suited for light to middle weight vehicles that are running decent power and used on road and track.

They are more suited to heavy use than the Billet 4.

Please check out our Monster calipers in the caliper section for more information.

Monster 4 vs Monster 6 Brake Conversions

One of the main difference between the calipers is that the Monster 4 is a 4 pot caliper and the Monster 6 is a 6 pot caliper.

Aesthetically, the Monster 6 looks better and also functions better as being a 6 pot caliper, it has been engineered to drastically decrease and almost eliminate pad taper wear.

Hi Spec 2 piece disc brake conversion contains:

A pair of radial mount calipers.

A pair of mounting brackets and hardware.

A pair of bells and hardware.

A pair of curved 48 vane rotors.

Extreme 8 - Brake Conversions

Our Extreme 8 brake kits look aesthetically pleasing as they are large calipers and look stunning behind the wheel.

The caliper was designed as an 8 pot so that the pressure applied to the pads is applied uniformly.

Road or Race

Minimum recommended wheel size


1 or 2 piece disc

Disc/Rotor Size

Road kit

18” Wheel

Billet 4

2 Piece Disc


Road kit

18” Wheel

Monster 4

2 Piece Disc


Road kit

18” Wheel

Monster 6

2 Piece Disc


Road kit

18” Wheel

Extreme 8

2 Piece Disc


All prices are exclusive of VAT.

Our conversions are made to order. Please allow up to 28 days from your purchase date to shipping of your Hi Spec conversion.

Before ordering please check your wheel clearances.  Hi Spec calipers are wider than the standard sliding caliper, therefore we cannot guarantee fitment for every wheel on the market.