Does my Fit need to be lowered to use it?

Yes. The Roll Center Adjuster for GK5 cars is designed for Fits lowered by 20mm or more. The manufacturer does not recommend it for a car at stock height or one lowered by less than 20mm, so it pairs naturally with a coilover kit or lowering springs that take the car below that threshold.

Is the Roll Center Adjuster for GK5 a simple bolt-on part?

No. Fitting requires a press, and the manufacturer recommends having a professional shop do the work. Once it is installed the ride height has to be reset and a wheel alignment carried out, which are not included. Torque every fastener to specification and recheck them regularly.

What does a roll center adjuster actually do?

Lowering a Fit changes the angle of the lower arms, which drops the roll center too far below the center of gravity. The bigger that gap, the more the body rolls. This part restores the arm geometry so the roll center sits closer to its ideal height, cutting roll and adding cornering grip.

Will I feel the difference on the street?

Yes. The manufacturer says the part suits street use as well as the circuit, and lists sharper front tire response, better steering feedback and a clearer sense of tire contact among the gains. It describes the part as essential for any lowered Fit rather than a pure race item.

Does it matter how the car was lowered?

No. The manufacturer says the effect is large on any lowered Fit, whether it sits on lowering springs or a coilover kit, as long as the drop is 20mm or more. The correction values were set through repeated testing on the Fit to find the best setting for the car.

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Description

J’s Racing Roll Center Adjuster for GK5 Honda Fit

J’s Racing’s Roll Center Adjuster for GK5 Fits fixes the geometry problem that comes with lowering. Drop a Fit and the lower arms tilt, so the roll center sinks too far below the center of gravity; the body rolls more, cornering force is lost and usable suspension stroke shrinks. Born from the Osaka tuner’s Super Taikyu and time attack programs, the part moves the roll center back toward its ideal position, using correction values J’s Racing settled on after repeated testing. It is meant for any Fit lowered 20mm or more; a car at stock height, or dropped less than that, does not need it.

Tips

Fitting requires press work, so J’s Racing recommends a professional shop. Reset the ride height and have the alignment adjusted afterward, tighten every fastener to the specified torque, and recheck bolts and nuts at regular intervals, without fail before each circuit session.

Features

Restores a lowered Fit to a better roll center height
Reduces the excess body roll that lowering creates
Improves tire contact feel and steering feedback
Quicker front tire response to steering input
Large gain in cornering grip, by J’s Racing’s assessment
Works on lowered Fits whether on springs or coilovers

Applications

Honda Fit: GK5 | 2013-2020 | 1.5L L15B

Notes

Recommended only for cars lowered 20mm or more; not recommended between stock height and a 20mm drop
Installation needs a press, and professional fitting is recommended
Ride height setting and a wheel alignment are required after installation and are not included
For the lowering itself, see the J’s Racing Black Damper RS coilovers for the GK5 Honda Fit
Sourced from Japan through J’s Racing USA; Bulletproof Automotive verifies availability and lead time as each order comes in

Frequently Asked Questions

Does my Fit need to be lowered to use it? Yes. The Roll Center Adjuster for GK5 cars is designed for Fits lowered by 20mm or more. The manufacturer does not recommend it for a car at stock height or one lowered by less than 20mm, so it pairs naturally with a coilover kit or lowering springs that take the car below that threshold.
Is the Roll Center Adjuster for GK5 a simple bolt-on part? No. Fitting requires a press, and the manufacturer recommends having a professional shop do the work. Once it is installed the ride height has to be reset and a wheel alignment carried out, which are not included. Torque every fastener to specification and recheck them regularly.
What does a roll center adjuster actually do? Lowering a Fit changes the angle of the lower arms, which drops the roll center too far below the center of gravity. The bigger that gap, the more the body rolls. This part restores the arm geometry so the roll center sits closer to its ideal height, cutting roll and adding cornering grip.
Will I feel the difference on the street? Yes. The manufacturer says the part suits street use as well as the circuit, and lists sharper front tire response, better steering feedback and a clearer sense of tire contact among the gains. It describes the part as essential for any lowered Fit rather than a pure race item.
Does it matter how the car was lowered? No. The manufacturer says the effect is large on any lowered Fit, whether it sits on lowering springs or a coilover kit, as long as the drop is 20mm or more. The correction values were set through repeated testing on the Fit to find the best setting for the car.

About J’s Racing

J’s Racing was established in Osaka in 1989, as VTEC engines and lightweight Civics and Integras were changing what a Honda could do, and it has built parts for Hondas ever since. The company develops engine response, suspension, braking, cooling and aerodynamics together as one system, then proves the parts in time attack, gymkhana, endurance and circuit racing. Its Fit lapped Tsukuba Circuit in 1’00.459, and its naturally aspirated AP1 S2000, the Maou car, became the company’s reference build for the Honda roadster. Every J’s Racing part is designed and tested in Japan, and J’s Racing USA in Carson, California handles distribution in the United States.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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J’s Racing Roll Center Adjuster for GK5 Honda Fit [FCJ-F5]

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J’s Racing Roll Center Adjuster for GK5 Honda Fit

Tips

Features

Applications

Notes

Frequently Asked Questions

About J’s Racing

Reviews