Help....I'm looking for an Alpha Q X2 Tandem Fork....anyone know of a source?
Help....I'm looking for an Alpha Q X2 Tandem Fork....anyone know of a source?
Calfee may still have some, but I'm not sure if they're selling them for aftermarket buyers. You'd need to contact them to find out. If they aren't selling them ask them for a recommended replacement, as they'll know what the next best thing is... or when the next best thing might be available as Calfee was working on an in-house solution to the demise of Alpha Q.
Precision Tandems still lists them but the prices are over the top; probably best to call around to some of the specialty tandem dealers, e.g., Tandems East, Mt.Airy Cycles, Crank-2 tandems, Tandems Ltd, Tandem Cyclerworks of Colorado, Gold Coast Tandems & Recumbents to see if they have any on hand.
It's really tough finding them as they were discontinued last summer and there just weren't a lot in the pipeline at the time.
There's one on eBay.
I had a car accident a while back and couldnt find one
all remaining stock is with Calfee and Como - bought direct from True Temper
May be some odd ones around and at one point Mel (TandemsEast) said he had one.
The Edge might be the ticket if you lose the ebay auction.
Thanks....Already contacted Calfee, Co-mo....they have a very limited supply and will not sell them w/o including a frame....they don't have a sure thing lined up for anytime soon. They both claim there going to be dead in the water soon....I've contacted most of these shops you noted and they have nothing...some didn't even know that these forks were out of production.
Used, cut-down with the plug glued in.....mmmmm
I spoke to Mel...at first he said he had one and then when it came down to it, nothing??? The Edge forks are real nice but the max weight is too low for 2 guys..... My fame builder is trying to work with them to make a fork????
The Alpha Q fork weighs 375 grams and the Edge 2.0 350 grams. Edge components in general, and the Edge fork in particular, are reputed very stiff and robust for their weight. So, it isn't known that the Alpha Q is more tandem capable than the Edge, though it has a tandem designation.Warning:Edge Composites forks are not approved for tandem bicycle use.
Edge knows that the tandem market is interested in its forks, but it may not think the tandem market worthwhile to test the 2.0 for that application.
Last edited by Ritterview; 02-25-10 at 11:57 PM.
Bontrager tandem carbon forks with Al steer tubes were being closed out a year or two back. Maybe there are some still available. We replaced the steel fork on our 2004 Trek T2000 with one and I like its quicker but not twitchy handling. Weighs lots less than the steel fork, more than the alpha q. I'm glad I got it instead on the alpha q. I ride withour worrying about it at all, but would have always wondered if my 375gm fork were going to fail during an unexpected event.
I'm not talking about carbon forks that develop stress cracks and have to be replaced or forks that broke as a result of a crash caused by something else, but an honest-to-goodness "just riding along and my tandem-rated carbon fork failed without warning"?
Co-Motion is using an Edge fork on this bike, from NAHBS. The Alpha Q is still listed on the website as the Macchiato's fork, but perhaps Co-Motion has made the switch. Co-Motion's imprimatur would provide some confidence in using the Edge 2.0 on a tandem.
Paketa now lists the Easton EC90 SL as its high end fork.
Last edited by Ritterview; 02-28-10 at 06:05 PM. Reason: Better photo
Most people I know think that the EC90 SLX is marginal on a single bike and opt for the SL as a stiffer alternative. SL on a tandem...Hmmm...
Still, to put all this single bike fork on a tandem stuff in perspective:
1) European safety standards have increased significantly in the last few years, without much reason as forks didn't previously fail through JRA use, so it's true to say that single forks are over-specified for most people, and now most cater to worst case scenarios of very heavy riders.
2) If a man weighing 140kg or whatever can ride a fork comfortably on a single bike, why should a man and a woman weighing 75kg plus 60kg on a tandem stress the fork any differently? My Engineering degree says the stresses experienced by the fork are the same. Basic mechanics suggests that the forces can only act on the fork through the headset bearings, wheel spindle and the reaction force from the tyre. As long as the total mass of the tandem and the proportion of weight through the front wheel is the same, the fork has no idea whether it's on a tandem or not. If the tandem riders ride in the same way as the rider on the single bike, then the forces must be the same. Note this assumes that the head tubes are equally stiff, which I think is a fair assumption.
3) Quite a few people have run cyclocross forks on road tandems without big issues reported (although this is like saying a lot of people do base jumping and you don't hear much about the deaths)
My personal view is thus moving towards it being reasonable for light teams to use high quality single bike forks on a tandem. I would agree that safety margins are lower than usual, so it would be prudent to install and inspect the fork periodically to avoid stupid risks. Question remains what constitutes a light team - is it 100kg, 150kg or 200kg?
It would be interesting if someone familiar with bike stress analysis and tandem / single bike impact standards could comment.
As long as your front brake was powerful enough you could definitely put more load under braking on a tandem than a heavily loaded single, due to the longer wheelbase. There is also those bumps and pot holes that you don't see in time. On a single you quite often have time to lift the front wheel, with the tandem you just have to plough on through.
The proportion of weight through the front wheel is not the same. On my single, I'm putting substantially more weight on the rear wheel (70-30? 65/45?), while on our tandem, we're about 45-55, as I recall - 45% front, 55% rear.
But your basic arguments still holds. I can find the force on my front wheel - put a scale under the front wheel with the rear held in a trainer, and the wheels level. Put both riders on the bike and read the scale (with binoculars if necessary). A single bike fork rated for a single rider who puts the same force on the front wheel - whatever the weight distribution - should have the same impact on the fork.
Question #6 of my Winter '05 Tandem Survey indicated 63% of the respondents claimed a team weight in excess of 140kg .jpg. Given that most folks understate their weight with about the same frequency in which they over state their average speed there aren't a lot of folks out there that would meet the threshold of a fork limited to about 300lbs. Oh, and don't forget to add in the weight of the tandem as ridden which is typically twice that of a single bike.
So, at least for manufacturers, why should they waste their time and profits certifying forks for tandems that are severly weight limited in terms of the standards used for mass-produced tandem bikes? I want to say that 400lbs - 450lbs is often times cited as the benchmark.
Conversely, since there are so few 'tandem-rated' components available, nothing prevents a lightweight team (noting I would peg lightweight at under 275lbs) from doing their own research to establish which forks are, in fact, rated for enough weight to accommodate the gross weight of their tandem. Again, I have over the years contacted a number of manufacturers to ask those very pointed questions "off the record" with regard to how well-suited a given compoment might be for our lightweight tandem team. Some will speak off the record and make it clearly understood, "you're doing so at your own risk... however..." before sharing if the design limits will accommodate. But, again, for general consumption by the masses, weight-limited components on tandems are just not worth the liability burden for anyone in the business.
And this is the time when it is most likely to matter.
So if your team plus bike is lighter than the heavy single rider plus bike, you're OK. Otherwise, the argument about weight distribution doesn't help much.
I have one, its new, never been cut or installed, I bought when I had my cannondale, but I changed tandem and it came with a carbon fork.
I would be willing to sell it, if someone is interested, I am in canada, but sinche its light should not be too expensive.
Just PM me if you have questions.
The Alpha Q feels too flexy to me really. I love the Edge 2.0 on my CAAD9 single.
Ritter, let me know how you like it on climbing out of the saddle and most importantly while cornering on speedy descents.
The behemoth steel one on our old Santana might have had too slow of geometry and was more like "driving a truck" but it was sure stiffer than this Alpha Q. If the Edge feels good, I would make the switch.
So,Originally Posted by Co-Motion
- The Edge fork on the NAHBS Machiato did not signify a Co-Motion endorsement.
- Co-Motion is testing forks from 3 manufacturers, one of which is Edge.
- Co-Motion will pick one of these to market as a Co-Motion fork.
- They will need a Co-Mo branded fork by May, when they exhaust their supply of Alpha-Q's.
Nice that Co-Motion is working on this, as a new carbon tandem fork is a welcome development.
Sweet Macchiato from NAHBS, nicely equipped with with ZG's, Topolino's and an Edge fork.
Therefore, when I post something like this...
You may also recall this tidbit from January 1st's Bulletin Board:
However, it does appear as though they do have a source. Probably best to call and speak with someone to get real time information on availability.
The price is definitely right...
Full disclosure: Frankly, I had a hard time believing Beyond Bikes (or anyone else for that matter) still had X2's in stock at full price, never mind at a 20% discount. So, just for kicks I put one on order. As noted above, the order sat in limbo for a while which seemed to suggest that there really wasn't one in stock that they could use to fulfill the order. When I called to check on the order after several business days had passed as the order sat in limbo the support folks said "It was showing as on-dock"??? Hmmm. Interesting. Well, I decided to let it ride and then on March 11th I receive a notice that it had shipped. Hmmm. Maybe they did find a source?
Well, the X2 showed up today only it wasn't an X2. It was a CX fork carrying a CX designation on the "Made in China" label and elsewhere that the distributor had gone and labeled as an X2. In fact, they went to the trouble of even attaching a label to the fork leg right along side the CX markings and cantilever bosses.
Anyway, it's going back to Beyond Bikes on a call-tag for a full refund. Thankfully, I already have a spare X2 fork so I'm not overly concerned.
Bottom Line: File this one under Too Good To Be True... which is what it seemed to be from the git-go.
Last edited by TandemGeek; 03-16-10 at 08:02 PM. Reason: Added link to photo of CX fork with X2 distributor labelling