Headset lower Bearing Type!

Hi,
I need to replace the Headset bottom bearing on my Merlin Evolution bike but unfortunately I can't get any info off the old bearing as its tarnished too much. I used an electronic caliper to get dimensions of 40 x 51.96 x 7.98. there is also a outside 45deg chamfer and an unknown size chamfer on the inside.
I can get two different bearings with correct dimension but two different internal chamfers, 45 or 36 deg
Q1. Does it make any difference for the size of internal chamfer?
Q2. Would a 40 x 52 x 7 mm bearing be suitable as its easier to get this size.
Merlin cycles wee not much help as they could only sell me a complete head kit and didn't know what size of bearing they installed in their bikes!
8) 8)
I need to replace the Headset bottom bearing on my Merlin Evolution bike but unfortunately I can't get any info off the old bearing as its tarnished too much. I used an electronic caliper to get dimensions of 40 x 51.96 x 7.98. there is also a outside 45deg chamfer and an unknown size chamfer on the inside.
I can get two different bearings with correct dimension but two different internal chamfers, 45 or 36 deg
Q1. Does it make any difference for the size of internal chamfer?
Q2. Would a 40 x 52 x 7 mm bearing be suitable as its easier to get this size.
Merlin cycles wee not much help as they could only sell me a complete head kit and didn't know what size of bearing they installed in their bikes!
8) 8)
0
Posts
2-http://mbbearings.co.uk/catalog/index.php?main_page=product_info&products_id=975
thanks for the advice but I should has mentioned in my previous post that it is "Merlin" the UK Lancashire based company and not the American one.
I advised only technical.
I could not find the listed bearing sizes and Merlin themselves could not tell me the size when I spoke to them however I did see the US Merlin bearing size mentioned on web site.
where did you find the information?
If you take the fork out of the frame and you may determine the internal chamfer at the steerer. (cone)
36 or 45 should be recognized.;...
I'll post on how I get on.
I can't speak from direct experience of this frame but if the old bearing was 7.98 why are you thinking of 7mm and not 8mm? I would expect with a 7mm you would need at least three (or even four) 0.25mm spacers or surely it would bind?
I will just have to get one over the internet and wait for it coming.
Thanks for all your help.
Found this site: http://rullabearings.com/
This has the bearing I require.