[Mr. RMB]

Jesseg has the idea that weight could be saved in the bottom bracket cups.

My XTR FC M970 bottom bracket cups weigh 79. The "sleeve" weighs around 5.

Jesseg said he thinks his Deus ones weigh 110. If so theres 20 grams right there. From what I recall last years XTR BB cups weigh 100 grams.

Can anyone with a deus, FSA, or similar type of bottom bracket system weigh there cups.

 

[Hardtailforever]

Aren't the new 970 XTR cups slightly different, though? I mean I know they work on the same principal, but they appear to be shaped slightly differently at the crankarm/bb-cup interface. May be insignificant, but maybe someone has tried installing an old XTR or other crankset on the new XTR bb?

 

[Cyco-Dude]

the weight of 110g is probably in the ballpark for the deus, xt, stylo and fsa external bbs. the cups and plastic sleeve on my afterburner weigh about 103g.

 

[Mr. RMB]

As soon as I get my cast off (broke my leg) I'll try installing last years XTR or Deus crank on this years XTR cups.

 

[Eddie3dfx]

That xtr bb is the lighest I have seen so far, if it really does weigh 79g. The token road skf bb I am using is about 85g minus the sleeve.

I have weighed 4 different ones.
Evolve XC BB
FRM BB
Token MTB BB
Token Road SKF BB

http://www.weightweenies.starbike.com/phpBB2/viewtopic.php?t=24980&highlight=bottom+brackets

http://www.weightweenies.starbike.com/phpBB2/viewtopic.php?t=25486&highlight=houston

 

[smithy]

Not 100% sure but I think my XT M760 cups and tube came out at 97g. Now on the bike so I can't be bothered pulling them off again to check!

 

[Cyco-Dude]

As soon as I get my cast off (broke my leg) I'll try installing last years XTR or Deus crank on this years XTR cups.

are they compatible? i thought the new xtr mounts up (or adjusts) differently compared to the older versions?

 

[Mr. RMB]

The adjust and mount different but thats a difference in the crank...they use the same cup system. Now that I think about it....my dads 05 XTR crankset is removed....I'll go try installing it with 970 cups.

 

[AndrewTO]

Jesseg said he thinks his Deus ones weigh 110. If so theres 20 grams right there. From what I recall last years XTR BB cups weigh 100 grams.

Can anyone with a deus, FSA, or similar type of bottom bracket system weigh there cups.

I concur with Jesseg. My RF Deus BB cups, sleeve and 3 spacers (1 gram each) hit my scale with a 114 gram reading. :thumbsup:

I'm horribly embaressed to say I did not ..... NOT ..... weigh these pieces individually as I considered them a "BB assembly". :madman: Wtf was I thinking? Bad Andrew ..... BAAAAAAAD!

 

[mpap89]

by spent '03 xtr cups were 98 without the sleeve.
Michael

 

[nino]

Atik

the Atik BB weighs 95,5g including sleeve, the Cups incl bearings alone 90g.

 

[Jesseg]

MegaExo a pig

Weight weenies has the steel FSA megaexo BB at 140 and the ceramic at 130. Presumably both with sleeve. I haven't really toyed with it, but I'm actually not sure if it has a removable sleeve at all. That's a 61 gram spread from the steel one down to the 970!

 

[Nixol]

THM Clavicula bottom bracket cups including Enduro Hybrid-Ceramic bearings

 

[Jesseg]

THM Clavicula bottom bracket cups including Enduro Hybrid-Ceramic bearings

I'm assuming that the Clavicula cups would be way more spendy than the 970 ones. What would they cost in the US, and where would you get them?

 

[mpap89]

What would they cost in the US?

way too much if you ask me. I think they are like $1k.
Michael

 

[nino]

no seals??

I'm assuming that the Clavicula cups would be way more spendy than the 970 ones. What would they cost in the US, and where would you get them?

add the outer seals and the weight isn't too low afterwards

 

[Eddie3dfx]

Those are light! how much do the seals weigh, a good 1-2g?
Were the ceramic bearings stock on that bb or was that aftermarket?
If they were aftermarket, do you know the weight before and after?
I will stick with my token-skf since the bearings are so smooth. Skf have always been one of the leaders in bearings worldwide, so I'll see over time how they hold up. over time.

Nino what do you use for chainring bolts?
Token says 5 male/female is 8.75g, but I haven't seen this confirmed. I believe a set of fsa bolts (12 in total) is 13g.
Both are pretty inexpensive and lightweight and I wasn't sure if anyone made anything lighter.

 

[nino]

seals are heavier...

Those are light! how much do the seals weigh, a good 1-2g?
Were the ceramic bearings stock on that bb or was that aftermarket?
If they were aftermarket, do you know the weight before and after?
I will stick with my token-skf since the bearings are so smooth. Skf have always been one of the leaders in bearings worldwide, so I'll see over time how they hold up. over time.

Nino what do you use for chainring bolts?
Token says 5 male/female is 8.75g, but I haven't seen this confirmed. I believe a set of fsa bolts (12 in total) is 13g.
Both are pretty inexpensive and lightweight and I wasn't sure if anyone made anything lighter.

you need covers, not only seals right there so they definitely add some weight.

if your balance shows a 1/100th of a gram you might be able to locate lighter aluminium bolts BUT us "mortal" weightweenies are happy with just ANY kind of aluminium bolts. they are all the same (at least up to a tenth of a gram):thumbsup:

 

[Asahi]

My 2006 XT BB with Sleeve is 103g. Not weighed them with my Enduro bearings but with that extra seal they are probably really heavy.

 

[Nixol]

Those are light! how much do the seals weigh, a good 1-2g?
Were the ceramic bearings stock on that bb or was that aftermarket?
If they were aftermarket, do you know the weight before and after?

I have done the ceramic bearing job myself. The ceramic bearings save 0,3 gram for each bearing. The seals weight 0,3 gram for 2 pieces!