You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Fork tube length ?
- Thread starter grewth
- Start date
After doing some research, the smart money seems to be on 580mm for the tubes, with an overall fork length of 753mm axle centre to top face.
Apparently the CB750F2 has 585mm tubes, same 35mm diameter.
And I just happen to have a pair that I've got no use for.
No idea if they can be mixed with F1 parts.
But I'll soon be finding out
Apparently the CB750F2 has 585mm tubes, same 35mm diameter.
And I just happen to have a pair that I've got no use for.
No idea if they can be mixed with F1 parts.
But I'll soon be finding out
Bit of a sore point for me this one after I sent my legs off for hardchroming and the company seems to have gone bust, these fork tubes are indeed 580mm x 35mm, I currently have K6 forks on mine so I can move it around, the F1 fork stanchions are like hens teeth, new ones are manufactured in Italy but are about £400 each!!
The other aspect is the diameter of the bore in the bottom of the leg for the oil stop which is different to the K model forks, one of the US CB750 forums has a table of part numbers and dimensions for cross reference but nothing crosses with the F1, another unique part.
I did put up a question on this forum a few months back, don't know if you've seen it?
Loki
The other aspect is the diameter of the bore in the bottom of the leg for the oil stop which is different to the K model forks, one of the US CB750 forums has a table of part numbers and dimensions for cross reference but nothing crosses with the F1, another unique part.
I did put up a question on this forum a few months back, don't know if you've seen it?
Loki
Cheers Graham !Bit of a sore point for me this one after I sent my legs off for hardchroming and the company seems to have gone bust, these fork tubes are indeed 580mm x 35mm, I currently have K6 forks on mine so I can move it around, the F1 fork stanchions are like hens teeth, new ones are manufactured in Italy but are about £400 each!!
The other aspect is the diameter of the bore in the bottom of the leg for the oil stop which is different to the K model forks, one of the US CB750 forums has a table of part numbers and dimensions for cross reference but nothing crosses with the F1, another unique part.
I did put up a question on this forum a few months back, don't know if you've seen it?
Loki
I'll look up that post of yours as soon as I have time.
When I was comparing stuff the other day I found out that the tubes in the F2 forks that I've got are 585mm long with very similar looking top plugs.
Dunno if it would be possible to build up a hybrid fork using F1 sliders on F2 tubes ?
Having said that the F2 forks I've got aren't in brilliant condition anyway, with some rust pitting too.
I'm also thinking that CB550F sliders might be the same as the F1, at 352mm long.
It might be easier/cheaper to source 550 parts instead.
F2 tubes might fit but you might need the matching oil locks doubt if the 5mm difference will be noticeable.
Loki
Loki
I wonder if the F2 oil locks might swap over too ?F2 tubes might fit but you might need the matching oil locks doubt if the 5mm difference will be noticeable.
Loki
I guess that at some point machining will be required and that equals £££££ unless you happen to have a tame pet machinist.
Alternatively, if you have tubes that are the right dimensions at the bottom end, but are just too long, it would be possible to have the top end shortened and new threads cut for the top bungs.
Again maybe expensive but it would work.
CB750A (automatic) also has 35 x 585 mm legs but I don't have details of the oil locks.
I had also wondered about shortening readily available tubes to fit, the sliders are cmmon to more models so swapping the oil locks would be viable.
Loki
I had also wondered about shortening readily available tubes to fit, the sliders are cmmon to more models so swapping the oil locks would be viable.
Loki
BTW I have fitted K7/K8 fork legs to my yokes just so I can move the bike around, I think the legs are 620mm, does put the front a bit higher so need a wood block under the side stand, doesn't fall over but leans a bit! The sliders are the same so the front brake fits.
Loki
Loki
Found these https://www.wrs.it/en/fork-tubes/19...med-honda-cb-750-f1-super-sport-750-1976.html just over £300 the pair free delivery from Italy, best price I've found so far.
Loki
Loki
Hmmmm.Found these https://www.wrs.it/en/fork-tubes/19...med-honda-cb-750-f1-super-sport-750-1976.html just over £300 the pair free delivery from Italy, best price I've found so far.
Loki
£300 for tubes with Italian chrome plating ?
I can remember having a CB250 front wheel with a Radelli chromed rim fitted.
Most of the chrome had fallen off long before I bought the bike.
These legs are hard chromed, very different to decorative chrome plating, I worked offshore with Itallian built hydraulic cranes and never had any chrome plating failures on the hydraulic rams even with regular drenching in salt water.
I'm taking some stuff to be chromed this week so will get their opinion before I pull the trigger but my options are now very limited due to circumstances beyond my control.
Loki
I'm taking some stuff to be chromed this week so will get their opinion before I pull the trigger but my options are now very limited due to circumstances beyond my control.
Loki
By the same definition, all fork tubes on Japanese bikes are supposed to be hard chrome, but I think we all know that it's not of the same quality you would find on a good industrial hydraulic ram cylinder.These legs are hard chromed, very different to decorative chrome plating, I worked offshore with Itallian built hydraulic cranes and never had any chrome plating failures on the hydraulic rams even with regular drenching in salt water.
I'm taking some stuff to be chromed this week so will get their opinion before I pull the trigger but my options are now very limited due to circumstances beyond my control.
Loki
I suppose with your original tubes being lost, you don't have much choice.
Unfortunately, due to oppressive health and safety legislation, you're not even legally allowed to rummage through the stock at a motorcycle breakers anymore, so the chances of you finding an overlooked set of F1 forks is probably zero
At least if I go that route I'll have a pair of refurbished K7/K8 fork legs to sell to offset the expense.
Loki
Loki
Similar Threads
- Replies
- 10
- Views
- 1K