I had a go at the arithmetic for the frame's BB height:
700c x 23mm tyre circumference is 2097mm (according to my computer calibration manual) so 2097/pi = diameter = 667.5mm. So it's 667.5/2 = 333.75mm from the centre of the wheel to the ground.
Subtract the BB drop to get the height of the BB above the ground: 333.75 - 61 = 272.75mm. Which is less than the Manchester minimum BB height.
And I suspect BB heights are normally quoted without taking the tyre into account, which would only make the BB on that frame even closer to the ground.
Between the braze-ons, the spacing, the bottle bosses and the BB height, I don't think it's worth the bother.
I had a go at the arithmetic for the frame's BB height:
700c x 23mm tyre circumference is 2097mm (according to my computer calibration manual) so 2097/pi = diameter = 667.5mm. So it's 667.5/2 = 333.75mm from the centre of the wheel to the ground.
Subtract the BB drop to get the height of the BB above the ground: 333.75 - 61 = 272.75mm. Which is less than the Manchester minimum BB height.
And I suspect BB heights are normally quoted without taking the tyre into account, which would only make the BB on that frame even closer to the ground.
Between the braze-ons, the spacing, the bottle bosses and the BB height, I don't think it's worth the bother.