Bimota Tesi Front Suspension Parts: What You Need to Know

Bimota’s Tesi series is famous for its unconventional hub-center steering front suspension, a design that replaces traditional telescopic forks with a system of linkages, swingarms, and a central spring-damper unit. This arrangement offers unique handling benefits but also requires specialized parts for maintenance, repair, or performance upgrades. Whether you own a Tesi 1D, 2D, 3D, or a later model like the Tesi H2, understanding the front suspension parts is essential.

Overview of the Bimota Tesi Front Suspension

The Tesi front end eliminates fork legs, using a pair of swingarms that connect the front wheel hub to the frame, with steering controlled by tie rods. The spring and damper are mounted horizontally or vertically inside the chassis. This complex system means that parts are not interchangeable with conventional motorcycles.

Key Components

• Front swingarms: These are the triangular arms that hold the wheel. Made from aluminum or steel, they pivot on bearings.
• Hub steering assembly: The front wheel hub contains bearings and connects to the steering links.
• Tie rods (steering links): Adjustable rods that transfer steering input from the handlebars to the hub.
• Central spring-damper unit: A single shock absorber (often Ohlins or Bitubo) provides damping and spring support.
• Linkage plates and rockers: Connect the shock to the swingarms.
• Bearings and seals: Needle bearings, ball bearings, and seals are used throughout the swingarm pivots and steering joints.
• Hardware: Bolts, spacers, and shims for precise setup.

Common Parts That Need Replacement

Like any suspension, Tesi components wear over time. Typical replacements include:

• Front shock absorber: Rebuild or replace with an upgraded unit from Ohlins, Bitubo, or Hyperpro.
• Swingarm bearings: Needle or tapered roller bearings that can get play.
• Steering tie rod ends: Ball joints or rod ends often wear and develop slack.
• Hub bearings: The front wheel hub contains two bearings that support the axle.
• Seals and dust covers: Protect bearings from dirt and moisture.
• Suspension linkage bearings: Small needle bearings in the rocker arm.

Where to Source Parts

Because Bimota is a niche manufacturer, parts availability can be challenging. Original Bimota parts are often discontinued or expensive. However, several aftermarket sources and specialist workshops offer solutions.

OEM Parts

If you want exact original parts, contact Bimota directly (now owned by the same group as Kawasaki) or authorized dealers. Part numbers vary by model year. For example, early Tesi 1D parts differ from the Tesi 3D. You can find online Bimota parts diagrams on official sites or enthusiast forums.

Aftermarket and Custom Options

Many Tesi owners upgrade to modern shock absorbers from Ohlins or Bitubo. Custom linkage plates can be machined to adapt newer shocks. Bearing kits are available from bearing suppliers using standard sizes. For example, the swingarm pivot often uses common needle bearings that can be cross-referenced.

Specialist Workshops

Companies like Bimota Spirit in Italy or independent suspension tuners in the US (e.g., Race Tech, Racetorx) can supply or machine parts. Some offer suspension rebuild services with upgraded valving.

Used Parts

For some hard-to-find items, used parts from eBay, Tesi Facebook groups, or Bimota forums are an option. Check condition carefully, especially on bearings and shock absorbers.

Maintenance and Inspection Tips

Keeping your Tesi suspension in top shape requires regular checks.

Check for Play

Jack up the front wheel so it's off the ground. Grab the top of the wheel and try to move it side-to-side. Any clunking or movement indicates worn bearings in the swingarm pivots or hub. Use a dial indicator or feeler gauge to measure play.

Shock Absorber Condition

Inspect the shock for oil leaks. A leaking shock needs rebuilding. Also check the spring for sag or cracks.

Steering Feel

If the steering feels notchy or has excessive free play, inspect the tie rod ends. Tighten locknuts and replace worn joints.

Lubrication

Regularly grease bearings if they have grease fittings. Some Tesi models have sealed bearings that cannot be greased; replace them when they wear.

Upgrading the Front Suspension

A common upgrade is to replace the stock shock with a modern unit that offers adjustability in compression, rebound, and spring preload. This transforms the ride quality.

Shock Options

• Ohlins S46HR1: Popular for Tesi 2D/3D, requires specific mounting points.
• Bitubo WME: Direct replacement for some models.
• Hyperpro: Offers spring kits and shocks tailored to the Tesi.

Linkage Modifications

To fit a non-standard shock, you may need custom linkage plates. Ensure the ratio matches the original to maintain proper progression.

Bearing Upgrades

Replace stock needle bearings with high-quality sealed units for longer life. Some owners convert to bronze bushings for reduced maintenance.

Part Numbers and Interchangeability

Because Bimota used many standard bearings and seals, you can often source generic parts. For example:

• Hub bearings: Often 6204 or 6004 series (check your manual).
• Swingarm pivot bearings: Needle bearings with dimensions like 22x35x20 mm.
• Tie rod ends: Common metric rod ends (M10x1.25 LH/RH thread).

Using generic parts is cost-effective but ensure load ratings match. When in doubt, consult a Bimota expert.

Recommended Approach for a Tesi Owner

If you need front suspension parts, start by identifying your exact model and year. Check the parts manual (available on Bimota forums). For routine maintenance (bearings, seals), source standard sizes from a bearing supplier. For the shock, rebuild your existing unit or buy a new aftermarket one from a respected brand like Ohlins or Bitubo. Use specialist shops for custom components like tie rods or linkage plates. Avoid cheap generic shocks—they can drastically affect handling.

For long-term ownership, stock up on common wear items such as bearing sets and rod ends. Join online Tesi communities to find recommended suppliers and shared part numbers.

Final Recommendation

Focus on getting the shock and bearings right. Restore the front suspension to factory spec or upgrade with proven aftermarket parts. Always use loctite on critical bolts and torque to spec. If you are not mechanically confident, hire a shop experienced with Bimota Tesi models. Proper setup transforms the Tesi from tricky to sublime.