Steering head bearings

[Ronnierockets]

Hi can anyone confirm the size of the steering head bearings in a bsa Q7
Thanks.

[JABBA99]

The attached is from the 1936 handbook in the members area off the website (for R17-R21-W6-Q-M10) .. looks like "ball and cups" style. I would think safest to measure with Vernier or similar the frame recesses (top and bottom) and fork "spindle" diameter to check what sizes you actually have in case of wear?

[Ronnierockets]

Hi JABBA99, thanks for your reply,
The steering stem is  1 1/8"thick  frame recesses are 5/16" deep (top) and 7/16" (bottom)x1 15/16"
Hope this helps ..
Ronnierockets

[Bicycle repair man]

They take 1/4" balls, 18 in each race. The ones that fit in the frame have tapered sides. The top one is a top hat shaped piece. The lower one that fits onto the forks is similar to the frame ones but with a smaller ID and straight sides.
Cornucopia list them but they require a mortgage.

[Ronnierockets]

Hi Bicycle repair man,
Prior to my post I tried different  size ball bearings in  one of the ball races and 1/4" seemed to the one.
Thanks for confirming that ,and for the information on the various pieces of the puzzle you kindly supplied.
I will have many more questions to ask as it's a basket case Q7 I am working on .
Thanks ..Ronnierockets...