Braced swingarm - triple

Hi Don - Hope you are upping the spindle size of the swinger - the original 14mm is a bit puny. A few of us raced our 750's with the Grimeca  2* 2ls brake and a 110 tyre - handled fine - forks were only 35mm and they coped well. Never weighed a double disc and caliper setup - could be interesting - Regards - Phil
 
Romeo.D said:
2 Lothar

My idea was K&J aloy swingarm , but he explained to me that steal one is much lighter so i take K&J sqare box stell one with weldings underneth , chrome platet ( bad polished and poor qality of chrome, and rust coming out after 1 year , have to rechrome it ) . Good swingarm but finish is not the best .
Price was around 500? some 6-7 jears ago .
Must admit that i was expecting bether qality from german company .
Click to expand...

Hi Romeo,

mmhh - I have a K&J steel one without lower support in my Jota since 12 years or so - no sign of rust (or I did not see it yet). Would be a shame if they dropped quality...

I have a steel one that came with the Motoplast. However, it is a) rusty and b) very heavy, that was why I was thinking about an alloy one. Now you are saying that alloy is heavier even than the steel one. That really makes me think if I should not just re-chrome the original one...  :-[
 
Laverdalothar said:
Romeo.D said:
2 Lothar

My idea was K&J aloy swingarm , but he explained to me that steal one is much lighter so i take K&J sqare box stell one with weldings underneth , chrome platet ( bad polished and poor qality of chrome, and rust coming out after 1 year , have to rechrome it ) . Good swingarm but finish is not the best .
Price was around 500? some 6-7 jears ago .
Must admit that i was expecting bether qality from german company .
Click to expand...

Hi Romeo,

mmhh - I have a K&J steel one without lower support in my Jota since 12 years or so - no sign of rust (or I did not see it yet). Would be a shame if they dropped quality...

I have a steel one that came with the Motoplast. However, it is a) rusty and b) very heavy, that was why I was thinking about an alloy one. Now you are saying that alloy is heavier even than the steel one. That really makes me think if I should not just re-chrome the original one...  :-[
Click to expand...

I like to belive that this was bad day by K&J , i drive in mediteranean klimate never in rain (except if it catch me few km to garage ) and bike is always in dry garage . If this swingarm was on some bike in germany that stays all year in open it wolud lok disaster till now .
 
phil37 said:
Hi Don - Hope you are upping the spindle size of the swinger - the original 14mm is a bit puny. A few of us raced our 750's with the Grimeca  2* 2ls brake and a 110 tyre - handled fine - forks were only 35mm and they coped well. Never weighed a double disc and caliper setup - could be interesting - Regards - Phil
Click to expand...
Up the axle size!!! You guys are killing me! This is the problem with this forum, there's just way too much knowledge here :D
Next time I'm going to submit my build plan for approval before starting. Arrgh!!
Okay, time to look through the boxes and see what I have for axles and spacers...... Thanks Phil
Oh btw can we get a consensus on what the ideal tire/rim sizes (rear only as I'm not re-doing the front!) would be remembering that this is going to be a street bike regardless of the somewhat racy bits.. I'm willing to buy a new rear rim such as one of these http://www.motocicliveloci.it/inglese/catalogue/cerchiborrani_uk.htm but don't want to do it twice...
 
consensus on tire width? we can't even agree on a BRAND of tires, how would you expect us to agree on a width?!?  :o :o

:LOL: :LOL:

My 2 cents..

Not sure if it fits, but 150/70-18 rear and 110-80 (or is it 110-90?!?)-18 fits my bike very well on 4" rear and 2,75 front.

If you stay with 2,15 or 2,25 (depending on what bike and rim you have) on the front, a 100-90-18 is max I would say and rear should not exceed 140-80-18 (or 140-70-18?!?) on a 3,5"

HTH
 
I knew you would weaken... :D :D :D
Wolfgang sells an SFC 750 swing arm spindle in 16mm diameter. It is wider than for a standard frame unless you reinforce the pivot points, but you could always cut the threads further into the spindle and rechrome it.
All you need to do is bore out the bearing bush thingies to suit the 16mm spindle.

If you find a 3.5 inch rear rim then a 150/70 tyre will fit and also be as large as you can go with the 3C swing arm. (offset chain etc notwithstanding).
 
Don,

A 140/70 fits a 3.5" rim perfectly. 

A 150 or even a 160 will fit, but there's no great advantage as these will be pinched in too far by the rim, they really do need a 4.00" or larger rim.  With a 3.50" rim, you'll end up using only about 60% of the treads' width... but you paid 100% for all that rubber! :D

Respect Phils comments, but I don't think you'll be in real need for a reinforced swinger axle on a road bike!  If you do go that route, you'll "need" to increase the rear wheel axle to suit! ;)

scuderia said:
Anyone know of a Borrani replica rim in a 3.5 or 4"?
Click to expand...

3.00" seems to be the limit.  Would also be OK for a 140/70, but a 130/80 suits it better.  Because of the squarely shaped centre well, it does look quite bulky compared to the narrower items.  A wider than 3" will look even chunkier.

Grant,

Not so easy to bore out those "bearing bush thingies", at least not with a homeworker Black & Decker...  They are very hard, you'll at least need a carbide tipped drill bit and a lathe.

piet
 
Yeah,

He's got a muthafucker of a lathe... built his new workshop right around it as he could hardly move it!

piet
 
My spoke  wheels are made by OCT , rims are "flat" not high as borani , San Remo rims on them is stamped 2,5 and 3,5 x 18 . Have same dimension PVM 3 spoke aloys on other bike , same tires BT012SS and i wonder why same tires seams wider on Jota . So im mesured rims widht , from one to another end on outside . PVM exactly as stamped but San Remo rims 2,75 fron and 4,15 rear , now i have idea to change those PVM for others they would be wide as San Remos .
 
As I said earlier,3.00 is the biggest Borani style made by Morad.You have the choise of it and a smaller tyre or a flat profile rim in a 3.5 or bigger and way better rubber.There are no Radials avalable for the smaller rim.
 
The Norton Norvil Production racers used Akront alloy rims , not so high shoulders as Borrani
http://www.buchananspokes.net/categories/akront.asp
 
Akront have been out of business for several years. 

The entire outfit is now called Morad... so Morads are essentially Akront replicas! :D

Currently fitting a set of San Remo flangeless to a Kawasaki Z1, seem to be very good quality, virtually no run-out and an all but invisible welded joint.

piet
 
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