Progressive Fork Spring Kit

Yes, the kit would include detailed installation instructions showing how long to cut the spacers as well as spring and washer direction.

In the kit, there will be instructions on how long to cut the spacer as well as how much fork oil will be needed.

Yes, that's correct - for most machines, Progressive includes the requisite washers and spacers required to complete the fork spring installation on any machine you select from our fit guide. In rare cases, you will be required to re-use the OEM spacers and washers. Basically, if you're servicing forks that are completely stock, you'll have everything you need to improve the front end on your bike.

For maximum performance we highly recommend that the forks be removed thoroughly cleaned, inspected and new fork oil installed with seals. The recommend spacer length from the installation instructions for this model is 2". The longer the spacer the more preload it will add to the spring and vise versa. As far as installation, you can complete this without full disassembly of the forks. All you need to do is remove the top cap and remove the stock spring.The damper tube assembly does not need to be removed to complete this install. You can drain the fork oil through the drain bolt on the lower leg. Follow the instructions for fork oil height and viscosity, it is normally different than the stock HD specs and can depend on your riding style. You can fine tune the damping with different weight oil. Higher number oil for more damping. You would then cut the provided PVC pipe to length to create the desired preload and install the spring taper side down then the spacer followed by the sealing ring and fork cap.

Yes, this would be an excellent match for the VTX1800C since, in the case of that machine, Progressive didn't see fit to make a heavy-duty fork spring kit for that bike. All you'll need to do when installing the fork springs is cut the included preload spacer tubes to the recommended length as indicated in the instructions. You'll find that, with the front and rear suspension updated with these parts, the bike will ride much better than stock and will feel sure-footed in the corners.

It's precisely during braking that you'll notice an improvement on the front. The progressive-rate springs do an excellent job of firming up as they're compressed. So, for big bumps or braking, they're just the ticket. I'm sure you'll find the springs to be a significant improvement over stock and at your weight, they're perfect for your needs.

It sounds like you're looking for suspension that's going to resist bottoming, versus wanting to raise the bike up for additional leg room at stops. In that case, as opposed to taller forks and shocks (a bespoke setup for the front, at the least), all you really need to do is match spring rate to your particular weight. For a 240lbs, rider, Progressive recommends heavy-duty rated springs. Heavy-duty springs really don't make for longer suspension travel, but are significantly more resistant to bottoming, especially when compared to the stock components with a rider at the upper end of of their design criteria (such as yourself). You'll find that the bike handles better in corners as it won't wallow nearly as much, and bigger bumps that would end with a thump taken care of with little notice. If that sounds like the problems you're encountering, you'll need the fork springs associated with your original question and a set of Progressive Heavy-Duty Shocks. While the fork springs themselves aren't offered in a heavy-duty rate for VTX1800 models, the rising rate spring design (resistance becomes greater the more they're compressed) will certainly be a significant improvement over the stock fork springs. And with the heavy-duty shock (choose the longer length), the rear end of the bike will be well sorted as well.

These springs don't change the way the fork operates, mechanically - they only replace the stock fork springs to improve the ride. If your machine is equipped with forks that are air-adjustable, you will still need to add air to them in order for everything to function properly. To replace the air system within the forks would require a complete Progressive Suspension fork cartridge kit. With that kit, you get everything you need to completely eliminate the air system on your bike, albeit, they're not available for nearly as many bikes as the fork spring kit.

The only real difference between the two bikes is that the GL1800A is ABS-equipped while the GL1800 uses standard brakes. Both bikes actually share the same front fork tubes, so regardless which model you choose, you'll get the correct front fork springs to fit your bike.

These springs are of the standard rate. We also have Progressive Heavy Duty Fork Spring Kits available on our website. For reference, Progressive Suspension recommends that heavy-duty springs be used for riders who weight more than 220 lbs., or for those that ride two-up and/or with a full load of luggage at least 50% of the time.

The BMW R75/5 front forks are identical between the two versions of the R 75/5. In fact, we just had one of each through the garage recently and the only difference we could find, other than the frame itself, is the seat on the long wheel base version is about an inch or so longer. That was it; engine, suspension &etc. were all identical. You should have no problem fitting these BMW R75/G fork springs to your machine.

Spring rate; standard -vs- heavy-duty, really depends on your weight more than the type of riding you do. If you're less than 220lbs and spend most of your time riding solo, then you should go for the standard rate Sportster Nightster Progressive fork springs. Should you weigh more than that, or you find yourself riding two-up at least 50% of the time, it's recommended that you opt for the heavy-duty fork springs.