The Fiamma Bike-Block Pro S 4 in Aluminium (part number 08831C01-) is the specific blocking arm designed to secure the fourth bicycle on a Fiamma Carry-Bike rack during transport. Made in Italy from high-quality aluminium with black and red fixing components, it weighs just 0.5kg and features an adjustable arm that spans from 54cm to 57cm. The front-positioned knob makes tightening and releasing quick without any tools, and the whole clamp and locking assembly rotates 360°, so you can adapt to almost any frame position. It fits Carry-Bike rail tubes with a diameter of 28mm to 35mm, which covers the full range of Fiamma Carry-Bike uprights.
Which Fiamma Bike-Block arm do you need to carry a fourth bike?
The Fiamma Bike-Block Pro S 4 is the arm required to hold the fourth bicycle on any Fiamma Carry-Bike model. Its adjustable arm runs from 54cm to 57cm and clamps onto bike frames with round or oval tubes between 25mm and 100mm in diameter. It weighs 500g and works with all Carry-Bike rail tubes from 28mm to 35mm.
The clamp head itself has a scratch-proof rubber insert integrated into the support base, so your bike frame stays protected against marking and vibration damage in transit. There's also an anti-theft safety loop built in, which lets you run a cable lock through the arm to deter opportunist theft at a campsite or motorway services. The adjustable joint lets the arm adapt to road bikes, mountain bikes, hybrids, and most standard frame geometries, meaning you don't need to think twice about whether your bikes will fit. If you're upgrading a standard 2-bike Fiamma Carry-Bike to carry four bikes, you'll need this arm alongside an additional Fiamma rail such as the Rail Quick or Rail Plus.
Motorhomers and caravanners adding a fourth bicycle to an existing Fiamma rack will find this arm a direct replacement or upgrade part. It works across the entire Fiamma Carry-Bike range, covering the Pro, Pro C, Pro N, VW, and E-Bike compatible models. The aluminium body is the same finish as the main Fiamma rack frame, so it looks the part too. It's sold individually, which is exactly what you need when extending rack capacity rather than replacing a full set.
Fiamma Bike-Block Pro S 4 Aluminium (08831C01-) Features
Improved ergonomics thanks to frontally- positioned knob.
Integrated scratch-proof support base with rubber protection
Aluminium tube curved to make it easier to attach the bike
Specifications
Weight: 0.5kg
Colour: Aluminium
Frequently Asked Questions
What is the Fiamma Bike-Block Pro S 4 Aluminium used for?
The Fiamma Bike-Block Pro S 4 Aluminium (08831C01-) is the specific blocking arm used to hold the fourth bicycle in position on a Fiamma Carry-Bike rack during travel. It attaches to the rack's upright rail and clamps onto the bicycle frame tube, keeping the fourth bike stable and secure throughout the journey. It is sold individually as an upgrade or replacement part.
What bike frame tube sizes does the Bike-Block Pro S 4 fit?
The Bike-Block Pro S 4 fits both round and oval bicycle frame tubes with diameters between 25mm and 100mm. This covers the vast majority of standard road bikes, mountain bikes, hybrids, and most step-through frame designs. The clamp head features a scratch-proof rubber insert that protects the frame during clamping.
Which Fiamma Carry-Bike models is the Pro S 4 arm compatible with?
The Fiamma Bike-Block Pro S 4 is compatible with all Fiamma Carry-Bike models, including the Carry-Bike Pro, Pro C, Pro N, VW editions, and E-Bike compatible variants. It fits onto Carry-Bike rail tubes with a diameter of 28mm to 35mm, which is the standard tube size across the Fiamma Carry-Bike range.
What is the arm length of the Fiamma Bike-Block Pro S 4?
The Bike-Block Pro S 4 has an adjustable arm that spans from 54cm to 57cm. This measurement refers to the distance from the rack upright connection point to the bicycle frame clamp. The arm length is longer than the Pro S 1, S 2, and S 3 versions because it needs to reach across three already-mounted bikes to hold the outermost fourth bike in position.
Do I need any other parts to add a fourth bike to my Fiamma Carry-Bike?
Yes. To carry a fourth bike on a Fiamma Carry-Bike, you need the Bike-Block Pro S 4 arm and an additional Fiamma rail, such as the Rail Quick 128 or Rail Plus 128. The rail provides the additional upright structure the arm mounts onto, and the Bike-Block Pro S 4 arm then secures the fourth bicycle frame to that rail. These parts are typically sold separately.
Does the Bike-Block Pro S 4 scratch bicycle paintwork?
No. The Bike-Block Pro S 4 has an integrated scratch-proof rubber insert built into the support base of the clamp. This rubber padding sits between the metal clamp and the bicycle frame tube, preventing paint damage and surface marking during transit. The quick-release front-positioned knob lets you clamp and release without excessive force on the frame.
What does the anti-theft safety loop on the Bike-Block Pro S 4 do?
The anti-theft safety loop is a built-in aperture on the Bike-Block Pro S 4 arm that allows you to thread a cable lock or padlock through the arm and around the bicycle frame. This adds a deterrent layer of security when leaving bikes unattended at a campsite, services stop, or overnight pitch. It does not replace a dedicated bike lock, but works alongside one.
What is the difference between the Fiamma Bike-Block Pro S and the Bike-Block Pro D range?
The Pro S range uses fixed arm lengths that span defined distances from the rack upright to the bicycle, with the number (1, 2, 3, 4) indicating which bike position the arm is designed for. The Pro D range features a longer articulated arm design with greater adjustability, making it better suited to situations where the standard S arm lengths don't provide the right reach for a given rack and bike combination. Both ranges fit the same tube diameter range of 25mm to 100mm.
If you’ve changed your mind about keeping your purchase, please return it in its original condition with proof of purchase and we’ll exchange or refund it. Unless faulty, this should be within 100 days of receiving your order. By original condition, we’d expect this to mean that you’ve kept packaging and labels, and that the item is undamaged and unused.
For further information of how to return your item, please visit the "Returning an Unwanted/Faulty/Damaged Item" section on our Help Page.
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