Increasing the distance from the balljoint centerline to the wheel centerline significantly increases the forces transmitted directly to your arms - thus increasing the death grip and arm pump as well as stress on everything in-between.

Anyhow.... I will be strictly using these rear wheel spacers for flat track - since I am a woods racer, it is much easier to remove and install wheel spacers than axles on my two quads.

I share your concern though on using wheel spacers on the stock axle for MX - although I'm not sure I understand why you don't have the same concerns about doing the it to the front (reversed wheels are the same as wheel spacers), not to mention the handling concerns mentioned.

That said, we tried a reversed front wheel setup on a 400EX for a while, we bent a whole lot of tie rods and flattened an upper control arm at the MX track before setting things back. Granted it did take a good size jump to waste the control arm, we were lucky it didn't cause a crash.

If you can afford it and are serious about MX racing, buy a set of more inexpensive arms, they should be able to be found in the $500 neighborhood. Then just have your existing shocks resprung and revalved. If you don't have the Ohlins, get a set of Works - they will be better than what you currently have. Even if you had to go the Works route, you'd have a complete setup for the price of the shocks you quoted earlier.

I have seen one bent Cannondale axle, although that quad got wrapped around a tree pretty hard. I don't believe the stock axles have a strength problem, they're pretty beefy. The 400EX axle holds up well because it flexes a lot, does a good job of returning to it's original shape.

 

I'm VERY serious about MX but unfortunately I'm 17 w/ a $6 an hour job that may not last very long (I"m not a bad worker, there just isn't a lot left to do [img]i/expressions/face-icon-small-sad.gif[/img]), and I have $208 payments every month. I'm going to quit racing for a while and just practice a lot instead. I'll be finishing the Texas LonestarState Championship Series, and I"m going to race the Full Moon Series... hopefully if I place high enough in those series, I'll be able to pick up a few sponsors (prefferably some that sell a-arms and axles). I will probably save as much money as possible to buy an axle but I need some 18" tires too. If I have any chance of buying a-arms, it will be sometime in Dec./Jan... but the thing I"m afraid of is that I might end up having to cancel my trip to Glamis than [img]i/expressions/face-icon-small-sad.gif[/img] [img]i/expressions/face-icon-small-sad.gif[/img] [img]i/expressions/face-icon-small-sad.gif[/img].

Gawd, it's times like these that I wish I was a little spoiled bass-terd. The package that K&K offers really caught my eye... Gibson a-arms w/ comp. adjustable Elkas for like $1920 or something like that... I assume that the kit includes fully adjustable Gibson a-arms (any size, hopefully) and compression adjustable Elkas all around. Do any of you know anything about Gibson a-arms???? Good quality?

 

I definitely know where you are coming from - I too had to pay for all my own stuff when I was younger & get by with what I could.

It makes me sick to see some of the kids on here that get everything given to them - they don't respect it at all...

 

I bought the rear wheel spacers thats screw on. Dennis Kirk sells them for 70 bucks. They aren't the Durablue E-Z fit ones. They are a little heavier then the Durablue donut and studs, but you can sell them to anybody w/ any bolt pattern, because there is no dounut....

 

It should be 50 inches.

 

My Moto Arms should be on in about two weeks. I also bought 2+3 offset wheels. It's the opposite offset of the stockers. May have to sell the new wheel tire combo, because I will be over 50". My Elka 19" shocks showed up yesterday.

 

Use 4+1 wheels. The further you put the wheel centerline from the balljoint centerline, the worse your handling will be and the more feedback you'll get to the bars.

 

Thats the stock offset isn't it?? I have Douglas Ultimates on all fours w/ stock offsets. Douglas mx package are .190's. They will bend..

 

I think the stock offset is 3+2.

 

Hey sangod, how are you putting 19" shocks on the moto arms? I thought they were 16" shocks?