OzVMX Forum
Clubroom => Vintage Track => Topic started by: Rosco86 on November 05, 2013, 06:42:42 pm
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What are the rules re flat trackers and use of rear disc brakes. Presently replacing front spool hub with a braked hub on a 70s Trackmaster. It's running a top quality rear disc brake on a quick change hub. Can it stay or does it have to go?
Rosco86
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has to go sorry rosco
my champion pre75 has honda hubs back and front all pre75 legal
my yetman has honda twin leader front and bsa rear all pre65 legal
my now sold staracer had yamaha rear honda front all pre78
this is were it gets stupid
1977 bultaco astro comes with rear disc brake but you cant ride it in evo but ok in pre85 pre90
jim
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So the rear factory disk on the Redline Champion 1972 750 Yamaha, that I am very very familiar with ,is a no goer. Sad really as it was on it when the Street brothers brought it and its clone twin out here ..back then.... I do have dated newspaper articles from then showing it leaning against the fences at Bendigo speedway....
Disk is a useless piece of equipment really and the type that used the rear sprocket as the rotor from the same era........ ::)
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Hey Tim was racing a night at The Bedingo Showgrounds when Herman (Trevor Flood) tried to punt the big yammie around. It was running a rear disc. Just a pity when you have to change the setup. Takes quite a while to find hubs that are of the period and fit. What suggestions do you boys have? Has bettor forks so I reckon a bullie hub will be the go, but the rear might be interesting. Left hand drive change, right hand brake??
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I'm not going to remove the disc off my Shell 750 Yamaha. To do that would destroy the integrity of a rare and historic bike. If you're intending on riding in MA dirt track competition you could challenge that both the Hurst Airheart and Grimeca disc brakes are pre 75 legal. It's time the brake rules for DT are upgraded.
(http://i1112.photobucket.com/albums/k495/firko2/firko2034/shellkannenberg_zps73deaa02.jpg) (http://s1112.photobucket.com/user/firko2/media/firko2034/shellkannenberg_zps73deaa02.jpg.html)
I just bought these'.....(http://i1112.photobucket.com/albums/k495/firko2/firko2035/AampA_zps9e5a3db3.jpg) (http://s1112.photobucket.com/user/firko2/media/firko2035/AampA_zps9e5a3db3.jpg.html) (http://i1112.photobucket.com/albums/k495/firko2/firko2036/AIRHEART_zps63f594ec.jpg) (http://s1112.photobucket.com/user/firko2/media/firko2036/AIRHEART_zps63f594ec.jpg.html)
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Pre 70 Legal
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Have photos of the bike I have racing in 73 in the States with the disc brake. Think I will restore her with it left on. Either they will let me trail around at the very back or they won't. Be a shame not to see these types of bikes out and about. If it only goes to some club days and Broadford Bonanza, so be it.
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Please don't change it Rosco!
Are you maintaining the 19" rims/quick change hub etc?
Cheers,
Steve
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Hey Steve, will be leaving it all original except I'll build a front wheel to replace the spool one but keep it for show and shines. I'm in Brissy and hope to have a punt around on it at Nudgee and Maryborough with the 22 year old son giving it a proper blowout. He hasn't raced since he was 16 . If he doesn't make the Aussie team for Glasgow it's togs in the cupboard and the smell of fumes instead.
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Think I will restore her with it left on
Good on you for leaving the disc on. I'm going to fit a disc to my Yamaha tracker ;). Are you bringing it down to Broadford next Easter? Jonesy, Phippsy and I are bringing along our big 750's as well as our other American flat trackers. Come on down and chuck a few skids.
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That's great Rosco, looking forward to hearing it at both venues in 2014. I'm struggling at the moment but hoping to have my bully sorted and a modern with R6 forks and 19's for next year.
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If the stars go the right way hope to take it to the Bonanza and catchup with the family. Hope you have recovered from your last busy weekend Mark. Leg healing ok? Limped around all day with gout in the right ankle and a shoddy left knee. At the doctors today to see what can be done with the knee. Need to lose weight badly but obviously like the good stuff too much.
Rosco86??
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If the stars go the right way hope to take it to the Bonanza and catchup with the family. Hope you have recovered from your last busy weekend Mark. Leg healing ok? Limped around all day with gout in the right ankle and a shoddy left knee. At the doctors today to see what can be done with the knee. Need to lose weight badly but obviously like the good stuff too much.
Rosco86??
Yeah, the legs OK, a bit of a decent scar but I'm ugly enough to handle another scar. That'll be good about Broadford, we're going to have rollers so no more of that pushing and kicking bullshit. I'm hoping to have my 305 Honda twin tracker there as well.
I'm going to make a concerted effort to knock off the last 30kg...the arthritis is bad enough without lugging around 130kg. I imagine our bikes will appreciate the gesture as well Ross.....good luck with it.
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Does that mean ill have replace the front (spooled) wheel on cycle factory tracker with a braked front wheel ?
If so any suggestions to keep it pre 75
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This is a point I commented on over at http://forum.ozvmx.com/index.php?topic=32150.msg313822;topicseen#msg313822 (http://forum.ozvmx.com/index.php?topic=32150.msg313822;topicseen#msg313822). According to MoMs you need a front brake Piney which really shouldn't be needed for long track or short track but you'll need it for dirt track with its stop and go corners. That's why I reckon these bikes should come under speedway rules if they're to be used for long and short track. If they're racing dirt track the current two brake rule is right, although I think period disc brakes should be allowed on bikes like yours and mine that had discs originally.
(http://i1112.photobucket.com/albums/k495/firko2/firko2001/flat%20trackers/flattracker010_zpsdcef4330.jpg) (http://s1112.photobucket.com/user/firko2/media/firko2001/flat%20trackers/flattracker010_zpsdcef4330.jpg.html)
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I apologise if I sticking my nose in here. But where in the MOMS does it say Classic Dirt Track bikes can't have a disc brake from the period the bike is in. Please note GCR 18.6.01. (n (i&ii). Classic Pre 75 MX & DT sidecars are permitted disc brakes manufactured before 31st Dec 1974 page 169. There is no where else in the Chapter (18) that mentions brakes apart from EVO.
Please note the wording for each period. "Acceptable for Pre 60 or 65 or 70 or 75 class are machines and components built up to and including the 59 or 64 or 69 or 74 model."
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There was a bloke running a triumph at the 011 Aussie titles at bris with a disc and the word from the steward was ok but if a protest is lodged you could be in trouble.
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If the disc brake was from the period the bike was built why would there be a problem?
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The 'no disc' rule seems to have disappeared from MoMs. In the only old MoMs I could find from 2001 and 2008 the rule states: "Disc brakes as originally fitted by manufacturers (Rokon, Dalesman and Tyron/Wassell" Seeing that the paragraph has now been removed one would assume that the rule"All major components must have been manufactured within the period or be replicas of components manufactured within the period, specified for the class in which the machine competes......" except, I can't find it in the current MoMs either, I took the rule verbatim from the 2008 book. Why these important rules have been removed is a mystery but I think we would now be safe in saying that period disc brakes would be allowed in pre 75 and pre 78 dirt track and, if one really wanted to push it, motocross.
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Period disc brakes ,electric starters on Pre75 MX !!!!! Never! hee hee hee ;) Look they just have to be kosher for Flat trackers. Enough Said. ;)
(http://i951.photobucket.com/albums/ad360/tdee754/scc.jpg) (http://s951.photobucket.com/user/tdee754/media/scc.jpg.html)
oh the current engine fitted is a 1969 build sand cast K0
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but I think we would now be safe in saying that period disc brakes would be allowed in pre 75 and pre 78 dirt track and, if one really wanted to push it, motocross.
Yes/maybe except for EVO which says
a) No linkage suspension
b) No disk (spelt wrong) brakes
c) Air cooled motors
On another subject is it time to introduce a cheap entry level class open to TS 185s and DT175s. Both are eligible for EVO regardless of what year they are manufactured.