Steering Head Build Measurements

[Karlloss]

Hi, does anyone know how to accurately measure a steering stem shaft so that I can build a steering head for my frame? I have the front end off a 1991/92 Suzuki GSXR400, but I don't have the frame to take measurements. It's the length of the steering head tube I need taking into account the dimensions of the bearings so I can the bearing seats machined etc.

 

[Bert Jan]

Hi, does anyone know how to accurately measure a steering stem shaft so that I can build a steering head for my frame? I have the front end off a 1991/92 Suzuki GSXR400, but I don't have the frame to take measurements. It's the length of the steering head tube I need taking into account the dimensions of the bearings so I can the bearing seats machined etc.

IMHO, if you do not know how to do it, don't do it.

There are a lot of ways to make another front end fit. Pick the route of least resistance. We can not explain to you how to do it, as there is no designated rule or workmethod.
Custom building means being in the shed a lot tinkering and trying.

 

[notlob]

I guess from what you have said earlier that you have the complete front end, forks, triple clamps, bearings, seals and stem nuts, and you want a steerer tube making to weld to your frame. If thats what you mean, then whoever is making the steerer tube for you should be able to do it if you give them all the parts. If are doing it yourself you need all the parts to get the measurements. Usually the lower bearing is recessed about 1mm to accommodate the seal and the top bearing is flush with the top of the tube, but that does depend on the type of top nut. Once you have the lower done you can measure up for the top bearing and tube length so that you dont locate the bearing to low on the stem below the bearing face and shoulder.