ATC 250r suspension tech

[oldskool83]

you gues need to learn to look up stuff on partzilla.com it tells you bolt sizes and bearing ID/OD/width...

[loganm]

I need to know the width BETWEEN the bearings.

[oldskool83]

yeah man...its there. Its called the sleeve..........same one used on a 86-87 200x.

[RubberSalt]

After reviewing the design of the swing arm, the flat bar isn't going to last. My recommendations for a cheap fast fix, some angle iron. It will provide the necessary vertical support to the full length, easy to weld on, and will provide strength somewhat close to square tubing while being combined with your set up.

Another option would be to add curved supports. I'd give an interesting look and much strength.



Are you close to Wichita, Loganm? The yard store has everything you could dream of as far as materials go. They are typically scrap aviation parts/materials. Very high quality and sold by the pound typically. All kinds of tubing, plates, pipes, etc.

[loganm]

I'm scrapping the current design. Still not 100% on the flat plate design though. Need to sort out my plasma if I'm doing that.

[loganm]

They're a little heavier than the balloons, not by much though. Bearings are at the machine shop, once those are done I can put this swinger together.

[briano]

All the extra weight is going to make it harder to push it home when you blow it up, AGAIN.

[oldskool83]

dont jump or flip much they tiny axle will bend at the mass point of extended hub. you just need to put a good rear shock on there and call it day and make it nice. are those 20's or 19's. I wont run bigger then 18's on a 3wheeler, no real need.

[loganm]

dont jump or flip much they tiny axle will bend at the mass point of extended hub. you just need to put a good rear shock on there and call it day and make it nice. are those 20's or 19's. I wont run bigger then 18's on a 3wheeler, no real need.

They're 20s. I think 20s were cheaper, I don't remember. It topped out at 60 with the 22s so I may add a tooth in the front or minus 2 in the rear. I'm planning on a durablue axle at some point, I don't expect this one to last. I don't plan on winning any pro level ATV races, just want to have some fun on the track.

I have a set of 2000 cr125 forks with triples on the way, and a complete 200x hub, rim, disc. Going to taper bearings in the head tube if it doesn't have them already, and maybe some extra reinforcement in that area.

[loganm]

Forks in. Straight, light visible scratches that I can't feel and some mild discoloration on one tube. Should be perfectly usable after a rebuild. Now to figure out triples, I think if I'll get some design ideas off the Google and take the forks into a machine shop and see if they'll build me some clamps. Also will need to have an axle made, I need the front hub first so I can figure out width and such.

If anyone wants my complete front end speak up, everything but the bars can go. Forks are straight, need seals. Front disc works, hub is good.

[loganm]

Triples in. Bottom clamp gonna need bored ~<1mm, top is too large, gonna need a sleeve or something. Pulling my front end off this weekend. Gonna get measurements for a new steering stem, and a front axle. I'll post up a parts list and total cost for the front end when I'm done. Hoping to be ~$600, could be cheaper if I already had a front hub and tire, and if forks and hub didn't need rebuilt.

[RubberSalt]

If your looking into rear axles, why not find the machine with a wide tough axle, the build your swing arm to bolt to the carrier?

That or find a machine that has cheap after market axles and adapt to that machine?

[loganm]

I honestly don't know. There's 1000 different directions I could go with this and honestly I'm just winging it at this point, there is some thought that goes into it but in 10 years parts will probably be hard to come by and I'm looking less from a parts availability longetivity standpoint and more of what can I build that will work okay. Plus right side drive makes it hard to find any parts.

[RubberSalt]

Oh yeah, right side drive.

I've got this figured out. Flip the carrier upside down! Polaris has a swing arm/carrier set up that could be flipped around without a problem. They are also tough, those machines were heavy. On top of that, the parts ran for ever without much change. The trail blazer, xplorer, trail boss, 330 400l, 350l, ect, All had the same frame. Even the scrambler and the sportsman.

Pretty much any Polaris from the 90s and early 2000s. Look for this swing arm and the carrier to match. It's also a chain tentioner by design.

[loganm]

Well, I measured something wrong... More like found the wrong measurement online, I can't even find where I found it. So I spent $50 on a useless piece of metal. Now is there a more accessible axle I can run? 400ex stuff?

Machine shop is boring my bottom clamp and making sleeves for the top. I'm gonna pull the front end off tonight, get measurements for a steering stem. When I get my triples back I can get measurements for an axle etc. like actual physical measurements, not "measurements" I find online.

Also, why not taper bearings for the rear axle? Seems like a much better fit, and would eliminate having that pesky collar.