Alexei Volkov
Mounting a plastic cafe seat is a simple process that can be done cheaply and quickly. It is important to ensure that the seat is safe, secure, and does not vibrate. The first step is to mark the frame where the seat will be mounted. This can be done by fitting hose clamps and marking them with a Sharpie. Next, drill holes for the bolts, and then grab your seat and some paint to mark where you will need to drill the seat for the bolts. Once you have clear paint marks, drill holes in the seat and slide it over the bolts, tightening with a nut. Finally, use upholstery to cover the bolts and nuts.
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What You'll Learn
Using hose clamps and bolts
To mount a plastic cafe seat using hose clamps and bolts, follow these steps:
First, fit the hose clamps around the frame where the seat will mount. Mark the clamps with a marker on the portion that faces straight up from the frame. Remove the hose clamps and drill holes that are large enough for bolts to fit through your marks. Drill a hole of the same diameter through the middle of a rubber stopper. Put the bolt through your hose clamp, facing outwards, and slide the rubber stopper over the bolt. Fit the whole assembly back onto the frame. Repeat this process for a total of four hose clamps and bolts.
The assembled mount should now be on the frame. Take your seat, along with some paint and a suitable applicator. Apply the paint to the top of the bolts and fit the seat to the bike. This will help you mark where you need to drill holes for the bolts on the seat. Once you have clear paint marks on the underside of the seat, use a drill to make the necessary holes.
This method of mounting a plastic cafe seat with hose clamps and bolts is a quick and inexpensive way to securely attach your seat. With the right tools and markings, you can ensure a stable and safe assembly for your cafe racer or bicycle.
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Drilling holes for bolts
First, fit the hose clamps around the frame where the plastic café seat will be mounted. Use a marker to clearly indicate where the clamps meet the frame. Remove the clamps and drill holes at the marked points, ensuring they are slightly larger than the bolts to allow for easy fitting. This step may vary depending on the type of plastic used in the chair, as some plastics may crack or break when drilling. It is essential to use the appropriate drill bits and techniques to avoid damaging the chair.
Next, with the clamps still removed, drill a hole of the same diameter through the centre of the rubber stopper, if present. The rubber stopper is important as it helps to create a secure and stable connection. Once the holes are drilled, reattach the hose clamps by sliding them back into position and securing them with bolts. Ensure the bolts are facing outwards to allow for the next step.
Now, carefully slide the rubber stopper over the bolt, providing a protective and stable layer. This step helps to prevent the bolt from directly contacting the plastic chair, reducing the risk of damage. At this stage, you should have a clear understanding of where the bolts will meet the underside of the plastic café seat.
Finally, mark these points on the underside of the seat with a marker or paint. This step ensures that you drill holes in the correct locations on the seat. Once marked, use a drill to create holes at these points. The holes should be slightly smaller than the bolts to allow for a tight fit.
By following these steps, you will have successfully drilled holes for bolts when mounting a plastic café seat. Remember to work carefully and take the necessary safety precautions when using power tools like drills.
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Using a rubber band solution
Mounting a plastic cafe seat can be done in several ways, one of which is using a "rubber band solution". This method is particularly useful if you don't want to modify the frame of your bike.
Step 1: Prepare the Rubber Bands
Firstly, source suitable rubber bands. You can purchase rubber bands specifically designed for this purpose, often sold as drive belts for vacuum cleaner brushes. Alternatively, you can cut rubber bands from old inner tubes. Ensure you have enough rubber bands to securely mount the seat.
Step 2: Positioning the Hooks
Place a hook on each side of the plastic cafe seat. These hooks will serve as anchor points for the rubber bands. Find corresponding points on the frame of the bike to attach the other end of the rubber bands. Ensure that the hooks are positioned securely and will not interfere with any moving parts of the bike.
Step 3: Attaching the Rubber Bands
Take the rubber bands and stretch them between the hooks on the seat and the corresponding attachment points on the bike frame. Ensure that the rubber bands are taut and provide enough tension to hold the seat securely in place. You may need to experiment with different band lengths and tensions to find the optimal setup.
Step 4: Testing and Adjustments
Once you've attached the rubber bands, carefully place the seat onto the bike. Check that the seat is stable and doesn't wobble or shift when you apply gentle pressure. If adjustments are needed, try tightening or loosening the rubber bands, or shifting the attachment points slightly, until you achieve a secure and stable fit.
Step 5: Final Checks and Maintenance
Before riding, ensure that all components are securely attached and periodically check the setup to ensure that the rubber bands haven't stretched or deteriorated over time. Replace the rubber bands as necessary to maintain the stability and safety of your plastic cafe seat mounting.
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Welding tabs to the frame
Welding can be a challenging task, and it is important to remember that it takes time to become a proficient welder. With that in mind, here is some information on welding tabs to the frame of a plastic cafe seat.
Firstly, you will need to decide on the type of welding to use and choose an appropriate welder. For example, a basic MIG setup is suitable for many welding tasks and is easy to learn. However, it is worth noting that inexpensive welders may be limited in terms of quality welding. If you are new to welding, it is recommended to practice on scrap metal first and focus on achieving a strong connection. Imperfections can always be ground down later.
Next, you will need to prepare the work area and ensure you are wearing appropriate safety gear, such as a mask and clothing that covers your arms and legs.
Now, you can begin the process of welding the tabs to the frame. One method is to weld mounting tabs, which are those bobber or chopper parts that you can find on custom mudguards, oil tanks, or fuel tanks. These tabs can be welded directly to the frame to provide a secure attachment point for the seat.
Another option is to use metal L-brackets, which can be bolted to the bottom of the seat pan. You can then drill holes in the brackets and metal tabs on the frame to bolt them together. Bending the tabs can also help create tension against the frame for a more secure fit.
Additionally, you may want to consider creating a pan underneath the seat to protect any wiring or batteries. This can be done using sheet steel, but be sure to choose the appropriate type and thickness for your specific application.
Remember to always follow safety precautions when working with power tools and welding equipment.
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Utilising existing fixings
If you are unable to weld, you can try to utilise existing fixings in the seat area. Instead of welding the bolts into the bar, drill holes and use a lock nut and some thread glue. Put some beeswax or a release agent on the thread and set the fixing bar aside for when you're ready to fibreglass.
Alternatively, if you are mounting a new fibreglass seat, you can use Frankenstuff's mounting brackets for cb750s, which do not require any frame drilling. You can also mount four blocks of aluminium on the frame rails where the flat portion of the seat goes and then drill through the pan and put some button-head cap screws there to hold it in place.
If you are mounting a cafe racer seat, first fit the hose clamps around your frame where the seat will mount. Mark the clamps with a Sharpie on the portion that faces straight up from the frame. Remove the hose clamps and drill a hole large enough to fit the bolt on your mark. Drill a hole of the same diameter through the middle of the rubber stopper. Put the bolt through your hose clamp, facing outwards, and slide the rubber stopper over the bolt.
If you are mounting a toilet seat, first locate the bolts at the back of the seat. Remove any plastic caps covering the bolts with a flathead screwdriver. Loosen the bolts with an electric screwdriver or a flathead screwdriver and a wrench. Pull up the toilet seat mount and remove the plastic bung. Unscrew the bolt and remove the plastic insert. Install the new seat by first lining up the new fittings and slotting the bolts through the toilet fixing holes. Secure the wingnuts with your hands or pliers, being careful not to over-tighten them. Place rubber washers between the nut and toilet to act as a cushion. Snap plastic caps included with the new toilet seat into place by pushing them down onto the bolts and wingnuts.
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Frequently asked questions
First, fit the hose clamps around your frame where the seat will mount. Mark the clamps with a sharpie on the portion that faces straight up from the frame. Remove the hose clamps and drill a hole large enough to fit the bolt on your mark. Drill a hole of the same diameter through the middle of the rubber stopper. Put the bolt through your hose clamp, facing outwards and slide the rubber stopper over the bolt.
You can also weld 2x tabs onto the frame rails and 2x M6 bolts to a piece of 15mm flat bar to suit them. If the seat is short, 2 tabs are fine, but for a longer seat, you may need a third tab and bolt at the rear.
You can use a rubber band solution. Cafe racers tend to be held together with rubber bands, e.g. the side panels or the back of the tank. You can buy these bands as drive belts for vacuum cleaner brushes or cut them from old inner tubes.
Put a hook on each side of the seat and find something on the frame to attach the band to. You can also attach the cushion via velcro adhesive pads and screw the seat on with nuts.
