pcnsd
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Posts: 113
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Post by pcnsd on May 23, 2008 20:36:40 GMT -5
Does anyone know what other fork clamps will work with or can be adapted to the SR stock tubes? Yamaha gear would be preferred if possible. I am interested in an offset less than stock, 35-40 mm would work best for my application.
Thanks
PC
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Post by solo2racr on May 23, 2008 20:55:41 GMT -5
I would try looking at some of the Yamaha offroad bikes with leading axle forks. I think I remember see a thread on here with a listing of 35mm forks, I just can't remember the name of the thread.
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pcnsd
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Posts: 113
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Post by pcnsd on May 23, 2008 21:47:55 GMT -5
I would try looking at some of the Yamaha off road bikes with leading axle forks. I think I remember see a thread on here with a listing of 35mm forks, I just can't remember the name of the thread. Thanks for your response. Dirt bike offsets were the first area I checked. I think you will find almost all leading axle clamp offsets at about 20mm. It will provide too much trail for my targeted fork caster of 26 degrees. I located the mentioned thread and the 84-85 RZ350 bears a closer inspection based on what little can be gleamed from the Yamaha parts site. Thanks again. PC |
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Post by aero on May 24, 2008 4:53:54 GMT -5
I was looking into XT 500 yokes, but the fork dia is different. So I was wondering if the Later SR500 with 18 rims had a different off set that would give more trail to calm the steering down a little?
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Post by malakiblunt on May 24, 2008 5:38:37 GMT -5
yes my XT forks are 36mm
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sven
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Posts: 166
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Post by sven on May 24, 2008 5:59:43 GMT -5
I was looking into XT 500 yokes, but the fork dia is different. So I was wondering if the Later SR500 with 18 rims had a different off set that would give more trail to calm the steering down a little? No, the SR yokes have all the same offset... If you want to use the XT yokes, 0.5mm pure aluminium sheets (Al 99.5) will do the job. Regards Sven |
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Post by caferacercarl on Jun 2, 2008 3:45:23 GMT -5
We have used single disc FZR250 trees in a couple of bikes [more for the pretty top clamp] and there's plenty of them at the wreckers cheap, but have not measured offset, but everything else with them is bolt in and laugh..cheers.
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Post by StewRoss on Jun 2, 2008 4:05:51 GMT -5
Hi Aero, The SR isn't real nervous as standard...18" wheel doesn't make a great deal of difference...if you're concerned about tank slappers it's easier to fit a steering damper of some type and that will stop the problem. Unless you want to play around in order to change the styling etc. then go for it... Less offset means the fork tubes come closer to the tank...can be an issue with clip-ons...although you can then reduce the lock as well...for a tracker style machine it probably wouldn't be an issue... Just a thought... SR  |
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Post by aero on Jun 2, 2008 5:43:42 GMT -5
All good stuff. I already have some old 'Wassell' trials type Aluminium handle bars. Renthals were too obvious  I have some shim plate for adjusting tool height, question is how much difference does fitting the XT yokes make? Too much trail is just as bad as too little as you'll make the thing handle like a chopper. But on the other hand I'd rather not have to add a steering damper as thats weight going on. I would imagine that if Yamaha didn't change anything an 18 inch wheel really doesn't make much difference. |
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Post by StewRoss on Jun 3, 2008 3:07:20 GMT -5
True, but the SR can tend to tank-slap in some situations anyway...you can get some light damper assemblies these days as well...having said that I have ridden with no damper ever since I've had SRs...have had some memorable tank-slappers though. I have noticed that the more unsprung weight that you put on the front the more the SR's prone to slapping... I am definitely fitting one to my new cafe racer and I will probably reto-fit one to my normal ride bike too. SR |
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Post by aero on Jun 3, 2008 6:13:44 GMT -5
I'm going down the loosing the unspring weight road and see what the bike handles like.
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sven
Full Member
Posts: 166
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Post by sven on Jun 3, 2008 11:35:46 GMT -5
I couldn't race my XT without a damper though the trail is longer than SR's stock trail. The bike has a nasty tendeny to wobble on straights ...
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Post by caferacercarl on Jun 12, 2008 3:10:01 GMT -5
lack of rebound in the rear makes front ends on road bikes slap, most of the fast yam 500 dirt bikes we've made have ended up with slightly longer swingarms to try and reduce wobble as well [and the road racer as well] remember, their only motorbikes not women, its fixable and you can change it for the better quickly,cheaply and usually without grief....cheers,
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Post by StewRoss on Jun 12, 2008 3:12:44 GMT -5
Hi Carl, I'm going to fit a longer arm to the new one I'm building...'bout 25mm or so longer I reckon. SR |
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pcnsd
Full Member
Posts: 113
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Post by pcnsd on Jun 12, 2008 22:05:45 GMT -5
lack of rebound in the rear makes front ends on road bikes slap, most of the fast yam 500 dirt bikes we've made have ended up with slightly longer swing-arms to try and reduce wobble as well [and the road racer as well] remember, their only motorbikes not women, its fixable and you can change it for the better quickly,cheaply and usually without grief....cheers, There is another (in my view more important) reason for an extended swing-arm or for that matter, changing the steering angle on the TT/XT/SR frame. That is to shift the weight bias forward. In my experience the TT frame with the steering angle pulled in and a 1" -2" longer swing-arm is the equivalent of most racing frames, only a few lbs heavier after a little massaging and as strong as most despite the 1020 tubing. Without these mods, it is a pig that pushes the front (under-steers) on corners at speed and wheelies on corner exit. Full second killers. On a separate but related issue, head shake has a long list of possible causes, the most common are sloppy or poor quality bearings at the swing-arm and steering joints followed by poor damper performance for a given setup and a "flexi" frame or swing-arm. The last major cause for me has been insufficient trail (less than 4" in my experience) on modified frames and so the need to have an offset that jives with your steering angle. PS. With regards to trail on the TT/XT/SR frame, I think there is a sweet spot between 4" and 4.3" that provides stability without sacrificing turning agility given a stiff/strong frame and swing-arm. PC |
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