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Fulcrum 7 Wheels Not Shimano Compatible

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Fulcrum 7 Wheels Not Shimano Compatible

Old 01-19-09, 08:43 PM
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Fulcrum 7 Wheels Not Shimano Compatible

I ordered a set of Fulcrum 7 wheels with Shimano-compatible rear wheel cassette body. Well, they are not really Shimano compatible. The rear wheel has the deep groove Dura Ace sorta cassette body - only Dura Ace 10 speed will fit on the wheel. I checked specs on line and they say the come in either 1) Shimano/SRAM or 2) Campagnolo configurations. But my SRAM cassette won't fit on what's supposed to be a Shimano/SRAM -compatible rear wheel.

If you look at these, the ridges on cassette hub body have an extra step to accomodate the Dura Ace deep groove cassettes, but the other types of Shimano cassettes and SRAM cassettes compatible with Shimano won't fit. The cassette will go on just slightly onto first groove, but when it hits the "step" on the grooves it stops and will go no further.

Did I get a Fulcrum 7 built with a Dura Ace cassette body? I didn't even see any specs on such a configuration - all say Shimano/SRAM compatible - which by definition means not DA compatible/not Shimano deep groove compatible.

Or....am I missing something here?
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Old 01-19-09, 08:51 PM
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Why don't you call them?
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Old 01-19-09, 08:59 PM
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I will, but since it's 10pm here I thought I'd ask around on BF to see if anyone else found this issue. From the pics I can see online on a Shimano/SRAM compatible wheel, the ridges should not have that second little step - that's what keeps my cassette from going on.

Any help will be appreciated.
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Old 01-19-09, 09:01 PM
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I think older fulcrums that came out were only DA10 compatible. later when SRAM components came out, I think fulcrum realized they needed to use the shorter splines otherwise they would lose customers who use SRAM. Now they offer hubs with the shorter splines that are compatible with all SRAM/Shimano.

So I believe you were sold an older fulcrum wheel set. You should complain to wherever you bought them for false advertising and demand a replacement.

edit: here's an old thread I created
http://www.bikeforums.net/showthread.php?t=378432

here's some more info

check out the section about spline width
http://www.sheldonbrown.com/dura-ace.html#10

The 10-speed version on the left is over 37 mm in maximum inside diameter, while the 9-speed version is only about 35 mm in maximum inside diameter.

so if your spline is 37mm wide from top of spline to opposite top of spline, you have DA10 only cassette. you can do this by bending open a paper clip and using the two endpoints as the measuring tool to measure the width. then use a ruler to see how far apart the ends are, that's what I did.

Last edited by Geoff326; 01-19-09 at 09:07 PM.
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Old 01-19-09, 09:29 PM
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Thanks, Geoff. My cassette looks like the 35mm diameter which won't work with the 37mm splines on the Sheldon link. Sounds like the SRAM cassettes use the 35m diameter configuration. It does say that Ultegra 10 speed cassettes went to the 37mm diameter spacing and will work on a DA hubs, too. It is not possible to install cassettes other than 10-speed models on Dura-Ace 7800 hubs, but I can use an Ultegra 10 speed cassette on that hub because, on the Shimano 10 speed cassettes, they use the 37mm spacing (Sheldon even used an Ultegra 10 speed cassette to illustrate 35 vs 37mm).

I may have an Ultegra hub rear wheel somewhere - if so it may be able to accomodate the SRAM cassette. And an Ultegra 10 speed cassette will fit a DA 7800 37mm splined hub.
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Old 01-20-09, 08:23 PM
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What's confusing from the Sheldon link is he seems to be saying that any Shimano 10 speed cassette will work with a DA hub - it's these odd hubs with the taller splines that are limiting cassette choices. Is Sheldon (RIP) saying that any Shimano 10 speed cassette with 37mm id will fit either a short spline 35mm hub or the odd DA 37mm hub? Any Shimano 10 speed cassette will fit either hub? So you could put a 10 speed Shimano 37mm id cassette on a short 35mm spline 9 speed hub?
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Old 01-21-09, 12:42 AM
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Originally Posted by markwebb View Post
So you could put a 10 speed Shimano 37mm id cassette on a short 35mm spline 9 speed hub?
Yes I believe that is correct. A cassette that has tall spline slots can fit tall (DA10) or short spline (8/9/10) hubs, but a cassette that has short spline slots (basically all SRAM/Shimano that isn't DA10), will not be able to fit a tall spline hub. It makes sense if you think about it.
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Old 01-21-09, 12:52 AM
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fulcrum 7 have two versions..one campy..and the other shimano...if i remember right..
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Old 01-21-09, 01:27 AM
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I ran into the same issue with my Fulcrum Zeros. When I purchased the wheel on Craigslist where it had a "Shimano compatible" freehub, I couldn't get my SRAM Red cassette to fit. My LBS confirmed that it was a DA-10 specific freehub and that I needed the Shimano 8/9/10 freehub for my SRAM Red. Thus I spent $100 ordering the correct freehub. Now that I have Campy 11, I had to get yet ANOTHER freehub for my Fulcrum Zeros ($100 again). In all, I have all three freehub bodies! Oh well ...
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Old 01-21-09, 02:07 AM
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I just had a cassette installed on my new Fulcrum Zeros - the hub body does look a bit different, but 10 speed fit fine. I'm not sure about 9 speed.
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Old 01-21-09, 02:44 AM
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my sram cassette fits fine on my f7s
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Old 01-21-09, 09:17 AM
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Originally Posted by neo****zy View Post
I ran into the same issue with my Fulcrum Zeros. When I purchased the wheel on Craigslist where it had a "Shimano compatible" freehub, I couldn't get my SRAM Red cassette to fit. My LBS confirmed that it was a DA-10 specific freehub and that I needed the Shimano 8/9/10 freehub for my SRAM Red. Thus I spent $100 ordering the correct freehub. Now that I have Campy 11, I had to get yet ANOTHER freehub for my Fulcrum Zeros ($100 again). In all, I have all three freehub bodies! Oh well ...
BINGO!

OP, if you bought these from a store, go back and ask for the 8/9/10 compatible freehub. It's not really a big deal to swap them.
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Old 01-21-09, 12:51 PM
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Originally Posted by Geoff326 View Post
I think older fulcrums that came out were only DA10 compatible. later when SRAM components came out, I think fulcrum realized they needed to use the shorter splines otherwise they would lose customers who use SRAM. Now they offer hubs with the shorter splines that are compatible with all SRAM/Shimano.
Bingo

My Fulcrum 1s are this way. Fulcrum wanted $150 for a freehub body to change it over
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Old 01-21-09, 04:17 PM
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Looks like you got a pair for shimano 10 only.

They can be purchased both ways, shimano 8/9/10 and shimano 10 only. Shimano 8/9/10 supports SRAM as well.

Give them a ring, and figure out if that cannot fix it for you.
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Old 01-21-09, 08:15 PM
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But...newer Shimano-Fulcrums use shorter splines. Makes it work with any Shimano. I got an older version that has tall splines.

Originally Posted by lemonlib View Post
fulcrum 7 have two versions..one campy..and the other shimano...if i remember right..
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Old 01-21-09, 08:17 PM
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You got newer version with short splines. These fit 35mm i.d. cassettes like SRAM, and also Shimano 9 speed cassettes. Basically, any Shimano 8-9-10 or SRAM will work on yours. You got the good hub !

Originally Posted by julz View Post
my sram cassette fits fine on my f7s
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Old 01-21-09, 08:30 PM
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I made them work.

My real purpose was to buy a new inexpensive wheel set and put a big 11-28 SRAM cassette on it, to make it easier for my poor 'ole legs to climb hills with my compact crankset. That way I won't need a triple crank. Shimano only goes up to a 27 big gear on cassete. So, when new SRAM cassette arrived along with the new Fulcrum wheelset, I was dismayed to find that the wheelset was the older Fulcrum 7's with the DA tall spline hub.

But - I had a Shimano Ultegra 12-24 10 speed cassette on my other wheel set (Rolf). I took that cassette off and found the Rolf hub had short splines. SRAM went on just fine. So now I had a wheel set with a big 28 gear.

Then...just as Sheldon Brown's (RIP) web site said
http://www.sheldonbrown.com/dura-ace.html#10
the Ultegra 10 speed cassette went right on the Fulcrum hub because the Shimano 10 speed cassettes are all 37mm i.d and work with taller spline hubs. So my new Fulcrum wheelset now has the Ultegra cassette.

I've now got a spare wheel set, and on my main Rolf wheelset I have the SRAM 10 speed cassette with the big 28. My new Fulcrum spare wheelset has the Ultegra 10 speed cassette.

So, it all worked out in the end, I just wish the eBay ad had said something about Fulcrum hub being tall spline requiring Shimano 10 speed cassette with 37mm i.d.

Lesson for all - when buying a wheel set for Shimano, ask if the splines are tall splines only suitable for 37mm i.d Shimano 10 speed cassettes, or are they short splines compatible with any 8-9-10 speed Shimano cassettes and any SRAM cassettes, for use with either 35mm i.d or 37mm i.d. cassettes.
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Old 01-21-09, 08:36 PM
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Originally Posted by Grimlock View Post
BINGO!

OP, if you bought these from a store, go back and ask for the 8/9/10 compatible freehub. It's not really a big deal to swap them.
It takes 2 minutes and 2, 17mm box wrenches.
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Old 01-21-09, 10:01 PM
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You should be pleased! Alloy freehub bodies plus Shimano/Sram cassettes = gnasty mess if you overtighten it. The hard steel cogs eat into the splines, which is why Shimano made a hub with a taller spline.
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