DIY: All Components and Accessories

Rear TriangleFront ForkChain Tensioner Mk2Derailleur HangerFork HookRear Mini Rack - Vostok TriangleFront Cargo RackRear Mini Rack - Stock BromptonFront Carrier Block

Assemble Your Own Kit

Below are all of our components: several universal Brompton accessories as well as our own titanium frame extremities and Vostok kit addons. We are confident that these are the ultimate titanium Brompton aftermarket components available today. We manufacture with unmatched attention to detail to complement Brompton's design and engineering standards.

How to Proceed

Please review the available options of finishes and possible compatibility considerations. Please mind that orders are currently carried out over email.


Get in Touch

Feel free to message us with any questions about the components and your future build.

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Discounts

Can I Get a Discount?

Definitely! Make sure to check out our Brompton upgrade bundles with a discount applied.

Rear Triangle

Material
Titanium alloy PT-7M
Weight
0.54 kg
O.L.D. spacing
135 mm
Brake mounts
IS Disk and standard caliper
Dropouts
Rohloff TS OEM as well as Shimano non-turn-specific
GOST 19807-91
Superior to Grade-9 alloy

Vostok Rear Triangle replaces the original Brompton bicycle rear frame assembly. It allows hubs like Rohloff Speedhub, Shimano Alfine or any other standard 135mm wide hub to be fitted with or without the disk brake.

The Triangle plays well with Brompton's design: the bicycle folds and rolls as expected. May be paired with a stock front fork as well as the Vostok Fork. When paired with a stock fork, the folding width of the bike does not change considerably.

Considerations: the dropouts will not allow crank arms to rotate 360 degrees when a bike's rear end is folded. Double chainsets may be a problematic fit be it a stock rear triangle or our custom one: choose your BB spacers wisely. Disk brake caliper space is tight and may not fit certain cheaper brands of cable-actuated calipers. There are no issues fitting hydraulic calipers of any kind.

The Triangle is compatible with a standard Brompton rear rack. We feel that our Rear Mini Rack for the Vostok Rear Triangle is the cleanest choice however.

forRear Triangle

Consider a Vostok Upgrade Kit

Popovich

  • Rear Triangle
  • Derailleur Hanger
  • Fork Hook

$619 as a kit

$646 if bought separately

Order

Front Fork

Material
Titanium alloy PT-7M
Weight
0.36 kg
O.L.D. spacing
100 mm
Brake mounts
IS Disk and standard caliper
Dropouts
Vertical, with titanium washers
GOST 19807-91
Superior to Grade-9 alloy

Vostok Front Fork replaces the original Brompton bicycle fork. It allows standard width front hubs to be fitted with or without the disk brake. The fork is designed to work with the Vostok Triangle: a set of titanium axle washers and a titanium fork hook are included.

forFront Fork

Consider a Vostok Upgrade Kit

Titov

  • Rear Triangle
  • Front Fork
  • Derailleur Hanger
  • Fork Hook

$989 as a kit

$1035 if bought separately

Order

Chain Tensioner Mk2

Material
Aluminium and Titanium
Weight
0.11 kg
Jockey Wheels
Aluminium 11 Deep Tooth Steel Bearings
Chain Line
43 to 58

A lighter modification of the original Vostok Chain Tensioner. Titanium jockey wheel axles, aluminium arms and jockey wheels. This chain tensioner interfaces natively with the Vostok Triangle and includes a recess for a Shimano anti-rotation washer.

The idea behind variable chain line is simple: by moving the jockey wheels across the axles, you achieve perfect chain line no matter the hub or sprocket or cranks you install on your Brompton.

forChain Tensioner Mk2

Consider a Vostok Upgrade Kit

Gagarin

  • Rear Triangle
  • Front Fork
  • Chain Tensioner Mk2
  • Fork Hook

$1149 as a kit

$1205 if bought separately

Order

Derailleur Hanger

Material
Aluminium
Weight
0.01 kg

The Derailleur Hanger is designed specifically to interface with the Vostok Triangle's drive-side dropout. It allows you to attach a standard rear derailleur for your cassette build.

forDerailleur Hanger

Consider a Vostok Upgrade Kit

Popovich

  • Rear Triangle
  • Derailleur Hanger
  • Fork Hook

$619 as a kit

$646 if bought separately

Order

Fork Hook

Material
Titanium
Weight
0.01 kg

The Fork Hook comes included with every fork purchased separately and with every kit. If you are purchasing a Rear Triangle separately, makes sense to add the hook to your order. With the rear-only conversion, the hook is optional, but recommended for a rear derailleur build. A rear derailleur, being wide and bulky, might not permit the full fold with the stock plastic hook. The Vostok hook permits modulating the gap between the fork and the rear triangle.

forFork Hook

Consider a Vostok Upgrade Kit

Popovich

  • Rear Triangle
  • Derailleur Hanger
  • Fork Hook

$619 as a kit

$646 if bought separately

Order

Rear Mini Rack - Vostok Triangle

Material
Titanium
Weight
0.2 kg
Carrying Limit
16 kg
Stock Brompton Triangle
No
Eazy Wheels Axles
M5
Rear Mudguard
R-type/L-type Mudguard Compatible

The Rear Mini Rack (Vostok Geometry) provides a clean and lightweight alternative to the stock Brompton rack when paired with the Vostok Triangle. The stays of the rack are welded to a 135mm O.L.D. standard. Available in both raw and satin finish.

forRear Mini Rack - Vostok Triangle

Front Cargo Rack

Material
Titanium
Weight
0.01 kg
Carrying Limit
16 kg

A front Brompton rack done right, with a wide base and vertical railings to attach your non-Brompton briefcase of duffel. Will sit firmly on the plastic or titanium carrier block.

forFront Cargo Rack

Rear Mini Rack - Stock Brompton

Material
Titanium
Weight
0.2 kg
Carrying Limit
16 kg
Stock Brompton Triangle
Yes
Eazy Wheels Axles
M5
Rear Mudguard
R-type/L-type Mudguard Compatible

Stronger than aluminium, more affordable than carbon. To our mind, the best titanium Brompton rack on the market today with a clean and lightweight design. All standard Brompton accessories supported.

forRear Mini Rack - Stock Brompton

Front Carrier Block

Material
Titanium
Weight
0.02 kg

Laser cut and welded titanium front carrier block was designed for the Vostok front rack. Will bear 20 kg safely.

forFront Carrier Block

Rear Triangle

Material
Titanium alloy PT-7M
Weight
0.54 kg
O.L.D. spacing
135 mm
Brake mounts
IS Disk and standard caliper
Dropouts
Rohloff TS OEM as well as Shimano non-turn-specific
GOST 19807-91
Superior to Grade-9 alloy

Vostok Rear Triangle replaces the original Brompton bicycle rear frame assembly. It allows hubs like Rohloff Speedhub, Shimano Alfine or any other standard 135mm wide hub to be fitted with or without the disk brake.

The Triangle plays well with Brompton's design: the bicycle folds and rolls as expected. May be paired with a stock front fork as well as the Vostok Fork. When paired with a stock fork, the folding width of the bike does not change considerably.

Considerations: the dropouts will not allow crank arms to rotate 360 degrees when a bike's rear end is folded. Double chainsets may be a problematic fit be it a stock rear triangle or our custom one: choose your BB spacers wisely. Disk brake caliper space is tight and may not fit certain cheaper brands of cable-actuated calipers. There are no issues fitting hydraulic calipers of any kind.

The Triangle is compatible with a standard Brompton rear rack. We feel that our Rear Mini Rack for the Vostok Rear Triangle is the cleanest choice however.

forRear Triangle

Consider a Vostok Upgrade Kit

Popovich

  • Rear Triangle
  • Derailleur Hanger
  • Fork Hook

$619 as a kit

$646 if bought separately

Order

Front Fork

Material
Titanium alloy PT-7M
Weight
0.36 kg
O.L.D. spacing
100 mm
Brake mounts
IS Disk and standard caliper
Dropouts
Vertical, with titanium washers
GOST 19807-91
Superior to Grade-9 alloy

Vostok Front Fork replaces the original Brompton bicycle fork. It allows standard width front hubs to be fitted with or without the disk brake. The fork is designed to work with the Vostok Triangle: a set of titanium axle washers and a titanium fork hook are included.

forFront Fork

Consider a Vostok Upgrade Kit

Titov

  • Rear Triangle
  • Front Fork
  • Derailleur Hanger
  • Fork Hook

$989 as a kit

$1035 if bought separately

Order

Chain Tensioner Mk2

Material
Aluminium and Titanium
Weight
0.11 kg
Jockey Wheels
Aluminium 11 Deep Tooth Steel Bearings
Chain Line
43 to 58

A lighter modification of the original Vostok Chain Tensioner. Titanium jockey wheel axles, aluminium arms and jockey wheels. This chain tensioner interfaces natively with the Vostok Triangle and includes a recess for a Shimano anti-rotation washer.

The idea behind variable chain line is simple: by moving the jockey wheels across the axles, you achieve perfect chain line no matter the hub or sprocket or cranks you install on your Brompton.

forChain Tensioner Mk2

Consider a Vostok Upgrade Kit

Gagarin

  • Rear Triangle
  • Front Fork
  • Chain Tensioner Mk2
  • Fork Hook

$1149 as a kit

$1205 if bought separately

Order

Derailleur Hanger

Material
Aluminium
Weight
0.01 kg

The Derailleur Hanger is designed specifically to interface with the Vostok Triangle's drive-side dropout. It allows you to attach a standard rear derailleur for your cassette build.

forDerailleur Hanger

Consider a Vostok Upgrade Kit

Popovich

  • Rear Triangle
  • Derailleur Hanger
  • Fork Hook

$619 as a kit

$646 if bought separately

Order

Fork Hook

Material
Titanium
Weight
0.01 kg

The Fork Hook comes included with every fork purchased separately and with every kit. If you are purchasing a Rear Triangle separately, makes sense to add the hook to your order. With the rear-only conversion, the hook is optional, but recommended for a rear derailleur build. A rear derailleur, being wide and bulky, might not permit the full fold with the stock plastic hook. The Vostok hook permits modulating the gap between the fork and the rear triangle.

forFork Hook

Consider a Vostok Upgrade Kit

Popovich

  • Rear Triangle
  • Derailleur Hanger
  • Fork Hook

$619 as a kit

$646 if bought separately

Order

Rear Mini Rack - Vostok Triangle

Material
Titanium
Weight
0.2 kg
Carrying Limit
16 kg
Stock Brompton Triangle
No
Eazy Wheels Axles
M5
Rear Mudguard
R-type/L-type Mudguard Compatible

The Rear Mini Rack (Vostok Geometry) provides a clean and lightweight alternative to the stock Brompton rack when paired with the Vostok Triangle. The stays of the rack are welded to a 135mm O.L.D. standard. Available in both raw and satin finish.

forRear Mini Rack - Vostok Triangle

Front Cargo Rack

Material
Titanium
Weight
0.01 kg
Carrying Limit
16 kg

A front Brompton rack done right, with a wide base and vertical railings to attach your non-Brompton briefcase of duffel. Will sit firmly on the plastic or titanium carrier block.

forFront Cargo Rack

Rear Mini Rack - Stock Brompton

Material
Titanium
Weight
0.2 kg
Carrying Limit
16 kg
Stock Brompton Triangle
Yes
Eazy Wheels Axles
M5
Rear Mudguard
R-type/L-type Mudguard Compatible

Stronger than aluminium, more affordable than carbon. To our mind, the best titanium Brompton rack on the market today with a clean and lightweight design. All standard Brompton accessories supported.

forRear Mini Rack - Stock Brompton

Front Carrier Block

Material
Titanium
Weight
0.02 kg

Laser cut and welded titanium front carrier block was designed for the Vostok front rack. Will bear 20 kg safely.

forFront Carrier Block

Caroline Alexander

Caroline Alexander (born 3 March 1968) is a cross country mountain biker and road cyclist born in Barrow in Furness, Lancashire.

Katie Archibald

Katie Archibald, MBE (born 12 March 1994) is a Scottish racing cyclist, who currently rides on the track for Great Britain and the Scottish Cycling Braveheart.com team.

A member of the Great Britain 2016 Olympic champion team in women's team pursuit, she is a former champion in the same event at both the World (2014) and European (2013, 2014 and 2015) championships. Individually, Archibald has been European champion in the elimination race in 2015, twice in the omnium in 2016 and 2017 and a four time European champion in the individual pursuit between 2014 and 2017.

In 2017 she secured her first individual global title, winning the Omnium at the 2017 UCI Track Cycling World Championships and won a third world championship the following year when partnering Emily Nelson to win the Madison at the 2018 UCI Track Cycling World Championships.