HPMGuy/R-Dubb triple clamps Group buy - KTM forks on your Airhead!

[SOLO LOBO]

THIS BUY THREAD IS NOW CLOSED (08/03/2011)!!!!


But see the end of this thread and Guy may do further runs!

Guy has used all the material he purchased for this run.

**10/19/2011 Edit** Renner emailed HPMGuy to see about another run... check the end of this thread


To help out Guy, I am putting this thread up.... I will not be fronting the $$ for other ADVR's who do want a set of these triples, and each will be accountable to settle with Guy on payment.

Using plans created by R-Dubb, HPMGuy is machining triple clamp pairs that will allow you to put KTM forks onto your BMW Airhead.... the clamps do not come with a stem, and a KTM stem must be acquired and machined to work.

This is the second run of these, and a few ADVR's have been running the first bach for a few years now, including Roadsacallin who took his around the world..

The original group buy thread is HERE and provides details on the triple clamps... I am sure that HPMGuy will chime in here to answer questions as well as providing details.

The original design thread is HERE

Originally Posted by Country Doc

I just got a quote from HPMGuy about 2 days ago. As you can obviously tell, I'm not pressuring this to happen.

He quoted for a minimum of six pairs (upper/lower triples) based on R-Dubb's drawings. I have attached his email below.

His quoted price for the raw unfinished product is $350 per pair. He is working off R-Dubb's plans, which use only 50 or 54mm (lower diameter) fork tubes (they will NOT work with WP4860's, he said there is not enough material to bore the lower triple clamp to fit the larger 4860 forks).

So there ya have it.

dc

___________________________

Hello Daniel,

Please find attached a quotation for BMW triple clamp sets as per R-Dubb's design/specifications. I have also attached a drawing of the triples in PDF format for your review. (It lost quite a bit of resolution.)

The triples are designed to be used with 50mm or 54mm fork tubes. There is not enough material left to accept the 60mm tubes you mentioned without rework of the design. Pricing does not include finishing (anodizing), but would be happy to quote that also if you would like.

Thank you for your interest,
Guy

Some information on the conversion, and picture of the member's bikes using HPMGuy's triples are located in my thread HERE

Other threads with info are HERE and HERE and HERE and HERE and HERE

Originally Posted by HPMGuy

Hello All,

I would be happy to produce another batch of these triples. I have had quite a few requests over the years for these, forwarded them to R-Dubb because it is his design, but appears that he is OK with these going into production again. (I'll need to contact him directly to make sure this is OK though before proceeding.)

As far as tube bore sizes, the original design was for 50mm and 54mm bores, but modifying the design to fit the 60mm forks as requested by Daniel would not be a huge deal. The only issue I can see is that it would add 3mm / ~1/8" to the clamp perimeter which could possibly interfere with something? I have no way to confirm/deny that this would even be an issue.

Figure anodizing will cost ~$20/pair if ALL triples are done at the same time and in the same color. I can get an exact quote on this if needed.

The triples do not include the stem, and IIRC R-dubb used the original KTM stem with a bit of modification.

Everyone I have delt with on AdvRider has been a stand up guy, so I don't have any reservations about carrying the production of these parts. Get a list going of serious buyers with desired tube diameter, I will machine the parts and accept payment directly when complete.


Let me know if you are interested,
-Guy

the goods:

[SOLO LOBO]

THIS BUY THREAD IS NOW CLOSED!!!!

Guy has used all the material he purchased for this run.

List of those who are buyers, not those on the fence or just window shopping!
BUYERS

WP Extreme 50mm Conventionals

1. Solo Lobo (50mm WP Extreme)
2. ontic (50mm WP Extreme)
3. TheBig Muff (50mm WP Extreme)
4. gsjam (50mm WP Extreme)
5. WalkingBear (WP Extreme)
6. Garthe (WP Extreme)

KTM 4860's

1. Airhead Wrangler
2. Borsiin (?)
3. Country Doc
4. Igmortis
5. Mungo57 4860s with new stem
6. GesII 4860s with new stem

Machining of a KTM stem to suit (possible including the stem)

1. Solo Lobo - I have a stem
2. Airhead Wrangler - AW has a stem
3. Igmortic - new stem
4. Country Doc - new stem
5. GSjam - new stem
6. Big Muff - new stem

[SOLO LOBO]

More info:

Originally Posted by HPMGuy

Yes, I am willing to do all three variations (50mm Extreme, 43mm USD, and the 4860) as long as there are multiple orders for each type.

I do not have a way of getting the dimensions off of 4860 forks, so someone ordering that style will have to take responsibility for verifying the bore diameters for the upper/lower clamps. The design of the triple will need to be reworked slightly to accept the larger bore (60mm) of the 4860, but is minimal and all other dimensions will stay the same (fork spacing/stem offset.) The 4860 style will however require buying larger stock, so there will be an slight upcharge for those who are interested, as soon as I know how many will be wanting this style, I will give an updated price.
Production will take 3-4 weeks including anodizing after order is placed.

-Guy

[Airhead Wrangler]

Alright, I'm in. (again) 4860 forks with stock KTM leg spacing, anodized black. I'd like to see a top view drawing of the rework for the 4860s beforehand if possible. Thanks.

[ontic]

I'm in,

3. Ontic (50mm WP Extreme forks) anodized black.

Cheers,

[TheBigMuff]

4. Definitely in as well - WP 50mm extremes. Anodised black would be fine, but ideally would prefer clear.
Cheers
Lachlan

[HPMGuy]

Originally Posted by Airhead Wrangler

Alright, I'm in. (again) 4860 forks with stock KTM leg spacing, anodized black. I'd like to see a top view drawing of the rework for the 4860s beforehand if possible. Thanks.

No problem, as soon as there is enough interest in this style (and someone can supply me with the bore diameters) I will rework the design and post a copy here.

[gsjam]

5. Count me in (50 wp extreme ,anodized black for a g/s)

[Airhead Wrangler]

Originally Posted by HPMGuy

No problem, as soon as there is enough interest in this style (and someone can supply me with the bore diameters) I will rework the design and post a copy here.

I need to buy some KTM triples just to get a usable stem. What if I just buy a set off of ebay and have them sent to you so you can get the measurements you need? Also, if I do that would it be possible to have you turn the KTM stem down to fit BMW bearings and press it into the new bottom triple?

[HPMGuy]

I need to buy some KTM triples just to get a usable stem. What if I just buy a set off of ebay and have them sent to you so you can get the measurements you need? Also, if I do that would it be possible to have you turn the KTM stem down to fit BMW bearings and press it into the new bottom triple?

That would be fine. Doesn't look like there is much interest in anything but the 50mm right now though, I would need to get an order for at least 4 sets of the 4860 style to make a run. You might want to wait and see what happens.

50mm guys are almost good to go on their own.....

[SOLO LOBO]

Here's one more old thread that gives the detail on the rake and trail for these triples (or so I believe)

LINK

[Airhead Wrangler]

Question about the 50mm forks - Can you even buy springs for these things anywhere? They'd need to be resprung, but the heaviest bike they were used on was the 640 adventure. Did anyone make any heavier springs for them?

[SOLO LOBO]

Originally Posted by Airhead Wrangler

Question about the 50mm forks - Can you even buy springs for these things anywhere? They'd need to be resprung, but the heaviest bike they were used on was the 640 adventure. Did anyone make any heavier springs for them?

Jay.T's guy the rebuilt his WP 50mm's added custom wound springs. I'll PM him and ask who the guy is.

Some more possibilities:

A google search says that inmate ZeroDog supplied custom wound springs at one point (06/10)

Lindeman advertises custom springs http://www.le-suspension.com/fork-services/

Superplush (KTM Experts) advertise "many rates" for their springs... http://www.superplushsuspension.com/

[SOLO LOBO]

Here's a good lead!

Originally Posted by Sasquatch

I can source those for you with no problems. I can also help figure out the right spring rate as well. Send me an email at jobesfzr@yahoo.com as it is easier than PM's and we can discuss this and I can quote them for you.

[Airhead Wrangler]

Hmmm. I was considering going the 50mm route and scrapping the 4860s, but not being able to buy off the shelf KTM springs easily and cheaply kinda sounds like a deal breaker to me. Plus I just gotta have that huge axle.