Help - Steering stem dimensions required

[BobM]

I have run into a problem with my ice sidecar front end
I need the ID of the bottom taper bearing on the sterringt stem for a 98.
Does anyone have either the bearing or a stem they can measure for me?
Hopefully it is 26mm like the upper bearing!
Thanks
BobM

[BobM]

The problem I'm having is matching a 86XR600 front end onto the 98 CR500 frame.

Looking at the fiches on line, the same bearing is used for the bottom of the CR500 steering stem from 90 thru 2001, Honda part number 91015-KZ4-701, unfortunately I can find no dimensions online for this bearing.

I urgently need this dimenesion as I dont want to buy and find the bearing is the wrong size.

I have run into a problem with my ice sidecar front end
I need the ID of the bottom taper bearing on the sterringt stem for a 98.
Does anyone have either the bearing or a stem they can measure for me?
Hopefully it is 26mm like the upper bearing!
Thanks
BobM

[britincali]

If I remember correctly the 85-87 use the same bearing top and bottom, the newer USD bikes have a larger lower bearing.

Im not 100% tho

[BobM]

Chris
You are correct, 85-88 used same top and bottom.
Question is re the id of the larger, later bearing, whether this will fit on an early stem

BobM

[britincali]

The newer steering stems are tapered they are larger at the bottom.

A newer style bearing will not fit on an older stem unless you are ok with it flopping all over the place. I suppose you could have a bushing made.

When I put a newer USD front end on an 87 I could not get a bearing to accomodate the larger lower diameter of the stem so I had it machined down to the same size as the top so I could use the older style bearing.

[BobM]

Im stuck with an old stem so I need the ID of the bearing to make up a sleeve.
Old stem is 26mm diameter, What is the diameter of a newer stem?

BobM

[britincali]

Dont know....

[TJC510]

late cr500
top - 47x26x16
bottom - 51x30x15
i couldn't find anything with a 51x26x15 dimention or the xr600 bearing dimentions

[BobM]

Thanks, that means we need a 2mm thick sleeve to make the old stem fit the new bearing.
Thats doable, other options were a lot less attractive?
By the way, have you ever found a non-Hoda source for sterring head bearings? They all seem to be non standard OD's & ID's

BobM

[TJC510]

i get just about all the bearings from all ballz. they have a better selection than pivot works.