Build Your Dream Custom Seat with Professional-Grade Mounting Hardware
Transform your bobber or chopper build with TC Bros' precision-engineered Weld On Solo Seat Spring Mounts. These CNC-machined mounts deliver the rock-solid foundation your custom seat deserves, combining old-school craftsmanship with modern manufacturing precision.
Why Riders Choose These Mounts
Imagine the satisfaction of a perfectly mounted solo seat that moves with you on every ride—no rattles, no flex, just smooth suspension action from your torsion springs. These aren't stamped sheet metal brackets that'll fail after a season. They're machined from solid 1018 cold rolled steel, built to handle years of hard riding.
Key Features
CNC Machined Precision: Crafted from 1018 cold rolled steel for superior strength and durability
Universal Fit Design: 1 1/8" radius cope fits both 1" and 1 1/4" cross tubes seamlessly
Stainless Hardware: 5/16"-18 stainless steel studs resist corrosion and maintain clamping force
Torsion Spring Compatible: Engineered specifically for torsion-style seat springs
Weld-Ready Finish: Clean steel surface ready for your torch—no prep work needed
Complete Kit: Includes 2 mounts, 2 stainless washers, 2 studs, and 2 nylock nuts
Technical Specifications
Material: 1018 Cold Rolled Steel
Stud Thread: 5/16"-18
Base Diameter: 1"
Cope Radius: 1 1/8"
Tube Compatibility: 1" and 1 1/4" cross tubes
Finish: Raw steel (weld-ready)
Country of Origin: USA
What's in the Box
2 × CNC Machined Steel Mounts
2 × Stainless Steel Studs
2 × Stainless Steel Washers
2 × Nylock Nuts
Note: Seat springs sold separately
Installation Made Simple
The pre-coped radius means these mounts sit flush against your frame tube right out of the box. Position them where you want your seat, tack them in place, check your alignment, then lay down a solid bead. The universal design gives you complete freedom to position your seat exactly where it feels right for your build.
Built by Builders, for Builders
TC Bros understands what custom motorcycle fabricators need because they're fabricators themselves. These mounts represent the same quality and attention to detail you'll find throughout their entire line of chopper and bobber components.
Ready to mount your custom seat the right way? Add these professional-grade spring mounts to your cart and take the next step in your build.
TC Bros. Weld-On Front Solo Seat Pivot / Hinge for Bobbers & Choppers
Regular price
$87.95
TC Bros. Weld-On Front Solo Seat Pivot / Hinge for Bobbers & Choppers
This pivot bracket is made from one piece of 3/16" steel for the ultimate in strength and simplicity. Unlike welded pivot brackets, the one piece design eliminates the possibility of a cracked seat pivot bracket caused by a failed weld. It also makes for a very low profile that looks great on just about every aftermarket spring style solo seat made. The long slotted holes permit a wide range of fitments and allow for adjustability. The finish on the bracket is black powdercoat for durability. This simple design also permits the weld-on mount to be mounted to either a round frame tube or a flat surface without a standoff and without interference to the pivoting action because the weld-on pivot mount is slightly larger in diameter than the rest of the components. The weld-on pivot mount is raw finish steel and ready to weld. The 3/8" hex socket cap bolt is stainless steel, as well as the washer and nylock nut so they will never rust. The replaceable bushings are oil impregnated bronze for a squeak free ride and very long life. Fitment possibilities are nearly endless. If you have a solo seat with springs on it, this bracket will probably fit.
Made in USA.
TC Bros - Cobra Seat
Regular price
$536.95
Hardtail Rigid Cobra Seat
TC Bros. Cobra hardtail chopper seats feature quality American construction and timeless looks. Handmade in the USA, these seats are designed to be a perfect fit to the TC Bros. 1982-03 Sportster weld-on hardtails using their mounting kit and fender.
Five 5/16-18 threaded mounts on the heavy 14ga powder coated steel seat pan make it possible to fit these seats to many other hardtail frames as well. Hand stitched from 100% Marine grade vinyl, these seats look like leather but without the maintenance.
Bolt-on some serious style to your bike with this seat!
Available in diamond or pleaded.
PLEASE CONTACT US FOR AVAILABILITY IF INTERESTED IN PURCHASING THIS ITEM. INFO@PERTHCOUNTYMOTO.COM
Add timeless style and comfort to your hardtail chopper with this handcrafted King & Queen seat. Built with American quality and designed specifically for TC Bros Sportster hardtail conversions, this seat delivers classic chopper aesthetics with modern durability.
Compatibility: Designed for TC Bros Sportster hardtail kits with matching mounting kit, fender, and sissy bar
Universal mounting: Six 5/16-18 threaded mounts fit many other hardtail frames
Weight: 10 lbs
Key Features
Handmade in USA - American craftsmanship and quality control
100% Marine-grade vinyl upholstery - Looks like leather without the maintenance, resists weather and UV damage
Hand-stitched construction - Premium detailing for lasting durability
Heavy 14GA powder-coated steel seat pan - Robust foundation that won't flex or crack
Six 5/16-18 threaded mounting points - Secure installation with universal compatibility
Choice of patterns - Available in diamond or pleated stitching
Classic King & Queen profile - Iconic chopper styling with passenger comfort
Pattern Options
Choose from two classic stitching patterns to match your build aesthetic:
Diamond pattern - Traditional diamond-stitched design for vintage appeal
Pleated pattern - Clean, linear pleats for a streamlined look
Why Choose Marine-Grade Vinyl?
Marine-grade vinyl delivers the rich look of leather with superior weather resistance and virtually no maintenance. It won't crack, fade, or require conditioning like leather, making it the perfect choice for choppers that see real road miles.
Complete Mounting System
This seat is engineered to work perfectly with TC Bros Sportster hardtail components (sold separately):
The six 5/16-18 threaded mounts also allow fitment to many other hardtail frames with proper mounting hardware.
Specifications
Seat pan material: 14GA powder-coated steel
Upholstery: 100% Marine-grade vinyl
Construction: Hand-stitched
Mounting points: Six 5/16-18 threaded inserts
Patterns available: Diamond or pleated
Country of origin: USA
Complete Your Sportster Hardtail Build
Pair this King & Queen seat with TC Bros hardtail kits, fenders, sissy bars, and oil tanks to create the ultimate custom Sportster chopper.
TC Bros King & Queen Seat Mounting Kit
Regular price
$77.95
King & Queen Seat Mounting Kit
Everything you need to mount your TC Bros. King & Queen Seat. Weld-on bracket is coped to fit our Sportster hardtail perfectly. Mounts are slotted if you want to use this for a universal/custom use.
TC Bros Rigid Solo and Cobra Seat Mounting Kit
Regular price
$77.95
Rigid Solo and Cobra Seat Mounting Kit
Everything you need to mount your TC Bros. Rigid Solo or Cobra Seat. The weld-on bracket is coped to fit our Sportster hardtail perfectly. Mounts are slotted if you want to use this for a universal/custom use.
Biltwell Macho Negro Seat Hinge - Black
Regular price
$134.95
Macho Negro Seat Hinge - Black
Overview:This investment-cast stainless steel seat hinge from Biltwell may very well outlast the rest of your motorcycle. Cast in stainless steel and polished, it fits all solo seat pans with protruding hardware in the nose. Two long slots provide a broad range of fore/aft adjustability. This seat hinge features a steel frame bung with self-lubricating bronze pivot bushings. Finished off with a chrome-plated shoulder bolt to fasten the unit to your moto.
• Black electroplated finish • Raw steel frame bung w/ bronze bushings • Cast Biltwell logo • Chrome shouldered Allen bolt included
Install Tip:For added insurance, use a drop of your favourite threadlocker when installing the pivot bolt.
OG Billet Seat Screw
Regular price
$49.95
Add a nice billet touch to your ride by changing your cheap stock Phillips head seat bolt with our all-new OG Billet Seat Screw. Includes a matching billet cup washer with a built-in rubber damper specifically designed to reduce the likelihood of loosening over time, ensuring a more secure fit. Comes with our OG Billet Bottle Opener Keychain allowing you to easily install and remove the seat screw due to its mating machined socket. Available in all our anodized and chrome finishes.
Features
Available in all our Anodized colors & Chrome finishes
Matching Billet Seat Screw Cup Washer included
Built-in rubber vibration damper specifically designed to reduce the likelihood of loosening over time
Machined OG logo
Grooved contour for easy "on the go" installation using the supplied Keychain or standard socket
Designed for installing Drag Specialties large and small spring solo seats
Includes spring mount bracket with 3" chrome springs, seat bracket, leather frame cover, and instructions
Mount is black powder-coated, steel spring mount studs are stainless steel and all other hardware is zinc coated
Height is determined based on spring style
Made in the U.S.A.
Fits 04-06, 10-20 XL
Mounting kit only. Seat not included
TC Bros - Hardtail Solo Seat
Regular price
$439.95
Hardtail Rigid Mount Solo Seat
TC Bros. rigid mount chopper solo seats feature quality American construction and timeless looks. Handmade in the USA, these seats are designed to be a perfect fit to the TC Bros. 1982-03 Sportster weld-on hardtails using their mounting kit & fender (sold separately). Four 5/16-18 threaded mounts on the heavy 14ga powder coated steel seat pan make it possible to fit these seats to many other hardtail frames as well. Hand stitched from 100% Marine grade vinyl, these seats look like leather but without the maintenance. Bolt-on some serious style to your bike with this seat!
Available in diamond or pleated.
PLEASE CONTACT US FOR AVAILABILITY IF INTERESTED IN PURCHASING THIS ITEM. INFO@PERTHCOUNTYMOTO.COM
V-Factor 2" Solo Seat Springs - Black
Regular price
$7.63
Premium Solo Seat Springs for Custom Motorcycle Builds
Upgrade your motorcycle's solo seat with these precision-engineered 2" seat springs, designed specifically for choppers, bobbers, and custom builds. Crafted from special gauge spring steel and carefully coiled to deliver the perfect balance of support and comfort on every ride.
Important: Springs are sold separately - Order the quantity you need for your specific seat configuration (most solo seats require 2 springs).
Key Features
Special Gauge Spring Steel - Engineered for durability and long-lasting performance
Precision Coiled - Carefully manufactured to ensure optimal tension and consistent ride quality
2" Spring Height - Ideal dimensions for solo seat applications
Black Finish - Sleek appearance that complements custom builds
Universal Fit - Compatible with most solo seat pans and mounting hardware
Perfect For
Whether you're building a custom chopper, restoring a classic bike, or upgrading your bobber's seat, these springs provide the reliable suspension you need. The black finish integrates seamlessly with most seat hardware and pan configurations.
Seat Thumb Screw 1/4 - 20
Regular price
$24.95
Seat Thumb Screw 1/4 - 20
Chrome one-piece steel construction
Wide, deep radiused slot accepts quarter or flat screwdrivers
Raised diamond knurl on edge
1/8" longer for easier seat installation with saddlebags or luggage racks
