Krooztune
Showa Billet Spring Seats
Billet Spring Seats – Showa 49mm
Upgrade the OEM plastic spring seat with the Krooztune Billet Spring Seat & Preload Adjustment System, designed for Showa 49mm motocross forks with 29mm cartridge tubing.
CNC machined from high-strength aircraft-grade aluminium, our billet spring seat provides a strong, precise and durable replacement for the OEM plastic component. An integrated spring guide bush is supplied pre-installed for smooth operation, accurate spring location and long service life.
Precision 1.5 mm Preload Adjustment
The key feature of the Krooztune system is the ability to accurately tune fork spring preload in 1.5 mm increments.
While the preload circlip positions are spaced at 3 mm centres, our unique offset billet preload spacers can be rotated 180° to alter their effective installed height by 1.5 mm.
This gives suspension tuners significantly finer control over spring preload without relying on additional loose shims or conventional spacer combinations.
Fine preload adjustment allows the fork setup to be better matched to rider weight, spring rate, ride height and the desired initial fork feel.
Direct OEM Replacement
Installation is simple.
The Krooztune billet spring seat directly replaces the OEM plastic spring seat while retaining the original OEM spring base, circlip and retention system.
No permanent modification to the fork is required.
Features
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CNC machined aircraft-grade aluminium construction
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Replaces the OEM plastic spring seat
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Integrated spring guide bush supplied pre-installed
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1.5 mm spring preload adjustment increments
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Offset billet preload spacer system
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Uses the OEM spring base and circlip retention system
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Allows precise individual preload setting between fork legs
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Strong, durable and serviceable design
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Designed specifically for professional suspension setup
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Developed and manufactured by Krooztune Suspension
Kit Includes
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2 × Krooztune Billet Spring Seats with guide bushes installed
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Billet preload circlip spacer set
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Installation instructions
Applications:
Showa 49mm motocross forks - current generation with 29mm cartridge tubes
Krooztune Performance Hard Parts — designed to give suspension tuners greater control over the details that make a great setup.
Product information
PRODUCT FEATURES
Get Your Perfect Setup
Not sure which setting, kit level or upgrade is right for your bike?
We’ll match your suspension to your weight, speed and riding style using real data and years of race-proven experience.
Submit your details and we’ll guide you to the ideal setup.
F.A.Q.
They appreciate cut and details, things that aren't so obvious.
Do you offer setup advice with this product?
Absolutely.
Every purchase includes access to our Setup Form, where we provide personalised guidance on your ideal settings, spring rates, and upgrade choices.
Can I purchase items with another currency?
Yes, you may select a currency based on your personal preference. When you select your country in the country selector and set to your country’s version of the website, you will see prices listed in the regional currency.
Can I make changes to my order after it’s been placed?
Email Info@krooztune.com asap and quote your order number. Our emails are checked daily before shipping out any orders
What if I have issues or need support after buying?
We’re here to help.
You can reach us anytime for setup adjustments, technical questions or installation support. Krooztune products are backed by real riders and real workshop support.
Do I need to pay extra tariffs or taxes when ordering from the USA?
No — Krooztune covers all USA tariffs and import taxes.
The price you see at checkout is final, with no hidden fees or surprise charges upon delivery.