4130 Chromoly Frame ATC250R

[El Camexican]

yeah I thought it was dirt cheap also - I've got to admit, looking at it, there is A LOT of time saving and easier ways to do things from the OEM frame that hes done here (which isn't a bad thing!) That helps contribute to that I'm sure, but I sure has heck wouldn't try to build one for $700. Not even $1400...

I know a guy with modified 250R engine that would look great in that frame.

[Billy Golightly]

That would be pretty neato

[tecaterob]

I wonder if there's enough room for a 450 motor. I'm going to reach out to him to find out. I would do that..

[Mr. Clean]

More pics from trx250r.net

There was also a discussion which stated "he said that he could weld the rear linkage mount in so that if the buyer wanted, they could use the entire TRX450R linkage set up from swingarm to shock to frame."

I tried on Mrs. Cleans faceplant account to find more information with no luck.

That mock up tank needs to be polished.

[Mr. Clean]

Hard to believe it can sell for only $700. A good drag bike swing-arm (solid mounted on struts, no bearings) sells for more than that today: http://www.pmfronline.com/chassis_components2.php I would have figured at least 2 large for that frame.

Search for Dave Moore racing. His swingarms range from 350-450 according to the site made of 1.5 inch 4130 chromoly.

Very reasonable price with bearings installed in my opinion.

[250rmanfmf]

You cant go wrong at 700 bucks. HRE was building 250r frames for $2,200. Not saying HRE is too expensive but it just shows the price difference on what we are use to. Even if people here are saying the frame needs to be finish welded, then people buying this frame with doubts just plan on completing the welds. Here it is people, finally a affordable chromoly 250r frame. Unless the people that get them start experiencing workmanship issues on the frame, lets support him. I am looking into his swingarms. great prices.

[The_Steve_Man]

Honestly if you look at the frame there really isn't a lot to it. And what I mean is he made the jig and he said he has the tubing laser cut so that takes a lot of labor out. $700 is an amazing price. I would gladly pay $1200 for one. He spent a lot of time in devlopement, which is worth a lot. It sounds like he is doing for love of the R and not for money.

[ironchop]

$700 is a STEAL!!! Period.

I`ve built a couple bike frames from scratch plus worked @ RC Components where we built frames for custom builds (ours msrp`ed for 2800 and up). There is a lot of work that goes into frame building and you can scrap one merely by welding it in the wrong order. I saw quite a few frames built by new guys who think frame jigs are capable of keeping welds from pulling and therefore they would tig one whole side at a time. Once you pulled it out of the frame table, it would "spring" and the neck would no longer run parallel or the hardtail would have one leg run higher than the other side, etc. Frames look deceptively easy but truth is he`s got a lot of R&D, trial and error, and forethought to make a frame that nice.

[ironchop]

I would really like to see that frame neck welded completely. Other than that it looks awesome!

I`m sure it is.....underneath that gusset.....no need for the neck gusset to get a full weld if you have welded the neck tube to the backbone and downtube both already

[oscarmayer]

I ain't knocking his workmanship. he did a nice job on it and it is a nice piece. I agree. if someone wants to be certain they can get it finish welded for cheap probably $100 or less if it makes them feel better. other than that, I say thumb's up!

[El Camexican]

I ain't knocking his workmanship. he did a nice job on it and it is a nice piece. I agree. if someone wants to be certain they can get it finish welded for cheap probably $100 or less if it makes them feel better. other than that, I say thumb's up!

Solid weld is not always better than stitches and the man who built that is an artist, not some hack who doesn't know how to finish his welds.

If you take that frame and add weld to it improperly it will twist and bend. Such is the relationship between steel and heat. Then you'll need to look around for someone with a torch, bucket of water and a rag to get it straight again and you'd better hope they know what their doing.

I hope someone here buys one.

[bad to the bone]

that is a nice frame

[Billy Golightly]

Solid weld is not always better than stitches and the man who built that is an artist, not some hack who doesn't know how to finish his welds.

If you take that frame and add weld to it improperly it will twist and bend. Such is the relationship between steel and heat. Then you'll need to look around for someone with a torch, bucket of water and a rag to get it straight again and you'd better hope they know what their doing.

I hope someone here buys one.

Yeah, I'm lead to believe that it was very meticulously welded that way so as to prevent war-page. Sometimes people look at factory frames and see tabs and gussets and think they should be finish welded, but they are intentionally done that way. Aaand...sometimes they aren't too But this thing is so carefully crafted everywhere else - it has its reasons I'm sure.

[El Camexican]

Yeah, I'm lead to believe that it was very meticulously welded that way so as to prevent war-page. Sometimes people look at factory frames and see tabs and gussets and think they should be finish welded, but they are intentionally done that way. Aaand...sometimes they aren't too But this thing is so carefully crafted everywhere else - it has its reasons I'm sure.

On that note... For a few years I was tasked with putting together welded suspension components for MCI prototypes. Basically they would give you detailed drawings and you would build the parts by hand all the while thinking of ways to tool up for the real deal and do the work in the most efficient way. Then there would be regular meetings in which you would get face time with the engineers that you use to ask for changes to better accommodate production, or lower costs. It was like being in a room full of Barnetts.

Once you had a few prototypes complete they would put them on what they called a "Shaker" (never got to see it). I believe it was a hydraulic powered fixture that could simulate road miles. Each prototype would spend a week or so on the Shaker and then if needed we'd get a revised set of drawings and start again.

Anyway, my point was that by the time we'd get designs approved it seemed that anything over 1/2" thick was always solid welded and anything 3/16" and under was always stitched 1/4" and 3/8" materials could go either way depending on the stress points they covered.

At the end of the day and for the purpose of the frame in question here, if a crack begins in a solid weld it will eventually crack the entire length. If a single stitch cracks the crack stops when it runs out. It's the same principal as drilling a hole in a crack, except you are building the hole into the design. It also allows a minuet amount of flex to the largest component in the assembly without the risk of cracking shorter parts attached to it.

[Poco Loco]

You never hear anybody speak of shot peen. I worked in a shop where we did shot peen on aircraft parts. That would be a great investment to a freshly built raw frame. It releaves any stress in the steel from welding, reduces cracks drastically and is affordable.