Author Topic: 21 inch cafe? (Read 61956 times)

754 · « **Reply #200 on:** January 10, 2009, 10:19:16 PM »

Should take 2.5 hrs or less for a welder to do the stretch with the method I have figured out, if you use 2 swingarms.

keeping the alignment will be easier than you could imagine or do on any other type of stretch, but hey. go for it.. Once you cut the front off or the legs you are going to be doing extra work to get it straight..

like i said before if the tires touches the arm gring out some claerance and weld in a plate.

The word was it was going to be done cheap, so quick-n-dirty makes sense to me.. try it out in basic form, if it works take it further.

Industrial Cafe · « **Reply #201 on:** January 11, 2009, 12:51:48 AM »

quick and dirty huh... Since you put it that way, I'll do it.

754 · « **Reply #202 on:** January 11, 2009, 10:58:44 AM »

OK I will explain my Swingarm stretch trick..

(havent tried it, but know it will speed things up!)
--------------------------------------------------------------------------------

First determine amount of stretch.

Gather material, either tubing or another arm to cut front off of.

say you are going 4 " stretch

Get 2 pcs of flat bar at least 1 inch wide by 6 inch long or so, at least 1/4 thick or +. Mark these pieces in a corner with punch or file, then clamp or tack together making sure sides are flush.

You need a drill the size of the swingarm bolt and a second swingarm bolt (engine bolt may work)

Now driil the 2 plates togeter, with 2 holes(swing bolt dia), 4 inches apart(or whatever stretch is), try to get them near the middle. Then brake apart but make sure they are marked .

Now slip these plates and a bolt thru the arm. Next you will use the second hole to hold the new front piece of 2nd arm or your machined parts.. after you get them to fit.

Go to 1/2 hr or more of cutting, grinding swearing, and drinking beer. (usually beer wont help accuracy , but this is almost idiot proof)

Now your swingarm xtension is fitting in the 2nd hole..
MAKE SURE THE 2 PLATES ARE ORIENTED THE SAME WAY AS DRILLED (this is the crucial part)

Now bolt everything together loosely. Your alignment now will be done on a flat surface by using shims under the drilled sideplates and clamping. If plates are wide enough it can be clamped direct to table.

Now tighten up the sideplates with the 2 long bolts and spacers , whatever it takes. When all is clamped, WELD..

BEER..Then paint ..BEER.. then install on frame..easy eh

Industrial Cafe · « **Reply #203 on:** January 11, 2009, 05:04:21 PM »

I drew it out as I read it and its looks simple enough. but in my minds eye, there is 2 front mounts, 4 inches apart on the finished product...

I know you said you haven't tried this method, but, you got any pics of a swingarm with a similar end result?

Industrial Cafe · « **Reply #204 on:** January 14, 2009, 07:48:03 PM »

alright! I've sourced some 40 hole chrome hoops.

21x2.15 and 21x3.25 for 35 and 40 dollars respectively.
and I might be picking up a dohc cb750 for 200 bucks.
it has the swingarm and the dual disc front end I want.
does anyone know off hand if the fork tubes will fit in my triple trees?

Patrick · « **Reply #205 on:** January 14, 2009, 07:54:48 PM »

I have the fork tubes from a 1981 CB750 in the triple trees of my '78 F3 750 Frankenbike right now. I'm using the dual piston dual caliper brakes from the '81 along with my '78 front wheel and disks.

Of course, it isn't actually running yet, so I can't describe the ride, but the fork tubes fit easily, if a couple inches longer.

Patrick

Industrial Cafe · « **Reply #206 on:** January 14, 2009, 08:06:21 PM »

well, every thing's good except for the longer part, I'm lowering the bike considerably.
I'll just rebuild the forks with my tubes if it's an issue.
I think I'll try to cut down my forks 2 inches on the lathe and rethread the tops. and maybe make some cool top nuts while i'm there.

probably not... I just came across a new lathe, and I'm eager to use it.

HavocTurbo · « **Reply #207 on:** January 14, 2009, 09:22:28 PM »

You thought about tires yet?

I'm a Michelin / IRC / Shinko dealer and want to throw some ideas at you.

You still thinking about 3" wide rims?

Industrial Cafe · « **Reply #208 on:** January 14, 2009, 09:27:23 PM »

well throw ideas man... I can only do what my wallet lets me though.

whaddya got?

HavocTurbo · « **Reply #209 on:** January 14, 2009, 09:31:00 PM »

Quote from: Industrial Cafe on January 14, 2009, 09:27:23 PM

well throw ideas man... I can only do what my wallet lets me though.

whaddya got?

http://mavrik-powersports.com/buy/Tires___Accessories/Street_Tires/Shinko_Cruiser_777_456678.aspx

These.... Come in a 90/90-21 and I would just flip it for the rear.

I have a couple more if you don't like the tread pattern.

Industrial Cafe · « **Reply #210 on:** January 14, 2009, 09:40:39 PM »

can i get that with a white wall?

Industrial Cafe · « **Reply #211 on:** January 14, 2009, 09:49:52 PM »

crap, only the 16 is.

HavocTurbo · « **Reply #212 on:** January 14, 2009, 10:15:37 PM »

I'll look around for white walls. Pretty sure they make em.

HavocTurbo · « **Reply #213 on:** January 14, 2009, 10:22:21 PM »

Only 21" wide white walls you will find are Avon and Metzeler....

Well over $100 each.

Industrial Cafe · « **Reply #214 on:** January 14, 2009, 10:27:33 PM »

poop.

hmm... I'm kinda bent on the 120/70 for the back...
but i cant seem to find anything in a 110 except for the 325/21 which is usually a dirt or dual purpose tire. is there a tire between 90/90 and 120/70?

Geeto67 · « **Reply #215 on:** January 15, 2009, 03:39:13 AM »

if you put a 90 series tire on the back the bike is going to push and walk in corners. Not a good idea. Is that 90 series tire even weight rated for a cb's carrying capacity.

Industrial Cafe · « **Reply #216 on:** January 15, 2009, 06:04:01 AM »

yeah I don't think I want a 90.

HavocTurbo · « **Reply #217 on:** January 15, 2009, 09:09:18 AM »

Quote from: Geeto67 on January 15, 2009, 03:39:13 AM

if you put a 90 series tire on the back the bike is going to push and walk in corners. Not a good idea. Is that 90 series tire even weight rated for a cb's carrying capacity.

While actual weight of the bike isn't anywhere close to the weight rating, carrying capacity would be irrelevant on a cafe styled bike. No passengers and what luggage you could fit would be minimal.

Quote from: Industrial Cafe on January 14, 2009, 10:27:33 PM

poop.

hmm... I'm kinda bent on the 120/70 for the back...
but i cant seem to find anything in a 110 except for the 325/21 which is usually a dirt or dual purpose tire. is there a tire between 90/90 and 120/70?

Maybe but I haven't found it. You could always try to find a black wall one.

Industrial Cafe · « **Reply #218 on:** January 15, 2009, 09:26:24 AM »

I mean do they make a 110/70/21 at all?
I could've swore I saw that size somewhere...

HavocTurbo · « **Reply #219 on:** January 15, 2009, 10:43:15 AM »

Quote from: Industrial Cafe on January 15, 2009, 09:26:24 AM

I mean do they make a 110/70/21 at all?
I could've swore I saw that size somewhere...

Continental Conti Race Attack
REAR 130/70/21

Avon Roadrider AM26
FRONT 90/90/21

Avon Cobra
FRONT MH90-21
FRONT 120/70/21

Avon Venom Bias-Ply
80/90/21
80/90/21 Whitewall
90/9021
120/70/21

Avon Roadrunner AM20
90/90/21

Dunlop D404
FRONT 80/90/21

Dunlop Elite3
FRONT 90/90/21
FRONT 120/70/21

Maxxis Classic M6011
80/90/21

Maxxis Promax M6102
90/90/21

Just to name a few.... There are quite a bit more. None of which I found were 110/70. Sorry.

Industrial Cafe · « **Reply #220 on:** January 15, 2009, 10:57:17 AM »

that's alright, i like the sound of that Continental Conti Race Attack 130/70/21.
but isn't that a 250 dollar tire?
maybe you could send me one as a... tester?
maybe write it off as a... business expense?

HavocTurbo · « **Reply #221 on:** January 15, 2009, 11:18:27 AM »

Quote from: Industrial Cafe on January 15, 2009, 10:57:17 AM

that's alright, i like the sound of that Continental Conti Race Attack 130/70/21.
but isn't that a 250 dollar tire?
maybe you could send me one as a... tester?
maybe write it off as a... business expense?

LOL if I sold them I would be happy as all hell to do that for you.

$250+ is what that tire costs.... If I had it I'd buy em.

Industrial Cafe · « **Reply #222 on:** January 15, 2009, 12:45:30 PM »

1080 · « **Reply #223 on:** January 24, 2009, 11:34:42 PM »

Here's some photos of a 23" dirt bike wheel on a '77.

Bouncer · « **Reply #224 on:** January 25, 2009, 07:51:22 AM »

Quote from: 1080 on January 24, 2009, 11:34:42 PM

Here's some photos of a 23" dirt bike wheel on a '77.

That looks like it may be just a tad tight to the front of the swingarm.

News:

Author Topic: 21 inch cafe? (Read 61956 times)