Al, The fit on the top frame lug is snug, I think the the lugs have been squashed in, as near the frame they are approx 0.5mm wider. The bottom swing arm lug is approx 0.30/0.35 wider. Not sure how much lugs are out of alignment as swing arm is off the bike and obviously not shimmed. But I would like to get a snug fit with swing arm lug when I fit it - as you said not to put any stress on it when clamping it up. Cheers Gaz
Tested my Sachs Boge in the ally lugs again today......I managed to get a 0.1 shim in either side of the lower shock eye....... .......but I have discovered something else I think.....I reckon the Sachs Boge shock lower eye knocks when rotated, on the swingarm frame lugs even when shimmed because of the shape of the shock............... ........looking at pics of a Showa shock, I don't think it will do the same. AL
Gaz........I have a Showa here on approval. For your info, I can't tell if the O rings that fit the Sachs Boge shock will fit the Showa in the same way........the top hat bushes are a different diameter. From what I can see, without taking a bearing apart is that the O rings are squeezed past the top hat bush, however they also fit neatly around the outside of the Showa top hat bush. The only thing is it is fitted with a Hyperpro spring, so I'm trying to get some idea of preload..........If anyone has one on their SS, it would be handy to know if it needs more or less preload than the OEM setting. And no, the Showa doesn't knock on the swingarm lugs like the Sachs Boge does; that because the Showa bottom eye is 1mm narrower than the Sachs Boge and the top hat bushes are smaller diameter, therefore there is more axial rotation of the Showa on its bearings. AL
Al, Yes, a bit comfused about the O ring size. I looked the Hirschmann SCP12 on the boge and the sizes seem to be the same size as the Showa 12 26 16 12 so I would have thought the O ring would have been 26 NOT 25 O.D. for the 26 bore in he shock mounting lug. So may be the O rings were for the outside Top Hat of the Boge. But at 21 I.D. I think it is a loose fit around the Showa Top Hat which is 20mm O.D. As I said in my sketch I will probably go for 20 or 19.5 I.D. for an outside Top Hat O ring to try and give it a bit of grip on the Top Hat and stop it from being sqeezed out of the lugs. Don't know if this will be of help because I think you are going to have to set the shock up with regard to your own body weight and sag of the shock but from the end of the threads to the top of the 2nd nut there were 12 explosed full threads. This might be used as a guide to then go on and set it up to suit your weight which I am sure you know and there are plenty of articles on it. This is were I am going to start when I put mine back together. Any more learned contributions most welcome on set up. Cheers Gaz.
Gaz, the O rings I have fit exactly inside the S Boge top hat bushes....there is a groove on the underside of the top hat for them. The top hat bushes on the S Boge are larger diameter than the Showa ones.......so they can't fit around the outside of the bush. But they will fit around the outside of the Showa top hat bush and will also be kept inside the frame lugs because the bushes are smaller than the lug end diameter..............However, I suspect that with movement of the bearing and shock eye on the Showa, the O rings will squeeze into the gap between the top hat bush and the eye itself. I know this because I have fitted the Showa and it is a much better fit; plus I can see the O rings in the gap just behind the top hat bush..........Unfortunately I have had to remove the Showa though....the effing thing leaks the moment it is bounced a few times and the amount of oil on the shaft from that effort is more than I can accept (there shouldn't be any really) and I anticpate it will p*ss out if I rode it........I don't intend to find out, so it is off to a repair place next week. So sod the sag for the time being......... Still I can now say that I can change shocks over in about 40 minutes. AL
Another correction. Sorry the Boge Spherical plain bearing is not not same as the Showa. Boge 12 26 16 12 (26 o.d.) Showa 12 22 9 11 (22 o.d.) Rest of the statement 2nd paragraph still is OK and I still don't agree with the o ring size they sent you, It's now a bit clearer why you did not have any room on the frame lugs to get an out side o ring with a Top Hat O.D. of probably 24/25mm. Cheers Gaz
I said that about the bearing sizes....the Boge bearing should be actually be 12 26 15.9 11.7, but the Hirschmann is near enough. And the O ring I have is absolutely correct for the Sachs Boge shock, but offering it against the top hat bush of the Showa, it fits around the outside of the top hat against the eye... The width of the eye on the Showa is 18mm and the Sachs Boge, 19mm....the shape of the eyes are different, so the SB cannot turn the full axial amount of the bearing when fitted to the ally swingarm.........the eye itself hits the mounting lugs. AL
