disc adapter plate for honda front wheels

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NOte: we no longer supply these laser cut parts!

The rise of cheap motard wheel sets and the increasing lack of Honda CBR wheels has led to virtually no orders for these laser cut parts, so unfortunately we no longer supply them. However, you can right click and save the dxf file here to have your own disc adapter plate laser cut from 4mm mild steel plate if you take this plate to a laser cutting service.

when is the disc adapter needed?

You don't need this disc adapter in the following situations:
- KLR650
- three-spoked CBR250R wheels on DRZ400, KLX400 and all the Yamaha WR and YZ models.

Why can't the Honda 310mm front disc be used with the KTMs and Husqvarnas, and/or with the six-spoked wheels? The Brembo calipers on the European models hit the disc buttons on the Honda floating front disc. And the problem with the six-spoked wheels is the front hub is wider and the offset nature of the Honda disc (e.g. it is dish-shaped) means you can't fit it within the forks and keep the front wheel centred.

NOTE: This disc adapter is designed to work on various Honda front wheels. As a result, you will notice the following:

First: the inner circle of the disc adapter is 62mm across so that it will fit on the VTR1000 and CBR900RR front wheels that can be used on most models. However, it only needed to be 58mm across to fit the CBR250R and CBR250RR wheels. This means that when you bolt the disc adapter to the 250 wheels, there will be a small gap between the disc adapter and the front hub.

Second: if using the three-spoked CBR250R front wheel, the disc bolts are 8mm whereas the disc adapter bolt holes are made for the 6mm bolts used on all other Honda wheels. This means you will need to drill the disc adapter bolt holes out to 8mm if bolting a standard DRZ400, DR650SE or WR450F etc disc to the CBR250R front wheel. This will still leave at least 2x4mm of steel between the bolt holes and the inner circle of the disc adapter, and steel is roughly three times stronger than alloy in this application. While this may appear overly thin, there is still far more structural integrity to the disc adapter plate than the disc bolt themselves, meaning that if hypothetically you could apply enough braking force, you'd snap your high tensile disc bolts before distorting the disc adapter.

is the disc adapter safe to use?

The disc adapter is laser cut from 4mm thick billet steel. This is far stronger than the alloy innner ring of any floating front disc, so is over-engineered for your safety. It is recommended that only the highest tensile strength bolts (12.9 grade) should be used, along with spring washers, Nyloc nutlocks and Loctite for added security. If these bolts are bare metal you will need to coat the heads in Rustkill or a similar paint. Ideally these should be checked before every ride, as you should do with all critical components on your bike.

If the specified parts are used, if a strong threadlock (e.g. Loctite) is used, and if you torque your bolts appropriately and do regular checks, the disc adapter should be as safe as any floating disc setup. However, you do use this disc adapter at your own risk. it is still your responsibility to obtain any safety checks, inspections and approvals required, whether for track use or public roads. You must read and agree to the disclaimer here before purchasing and using this disc adapter.

what's the advantage of a floating front disc?

First, floating front discs are usually around 5mm thick, compared to the typical 3mm of a specialist supermoto disc. While this extra width means there are finer tolerances within your front caliper, the extra disc width allows better heat dispersion characteristics, so there's less chance of brake fade and warping of your disc from heavy braking. Supermoto discs are often kept at the same width as the original dirt discs (e.g. 3mm) which is very thin for high speed road braking.

A floating front disc will not transfer heat to the inner alloy ring, so there is more even distribution of heat through the metal; again this means much less chance of your disc warping. An interesting point to note is that sometimes your front disc will warp if it is suddently hit with water (e.g. rain puddles or washing your bike) soon after heavy braking! A floating front disc reduces your chance of this happening.

Keep in mind, these advantages only really apply in extreme braking situations such as racing or very hard road riding. For most of us an non-floating disc will be fine in all situations.

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