105 vs ultegra chainset weight

[Hackfall]

I am comparing these two:

http://www.wiggle.co.uk/shimano-105-570 ... -chainset/

http://www.wiggle.co.uk/shimano-ultegra ... -chainset/

compared to my current RX100 chainset with a titanium bottom bracket.

The weight amount specified for the ultegra is 785g including the cups

My estimate is that that combined weight of my RX100 chainset and Ti BB is about 1100g or slightly over

There is no weight figures that i can find for the 105 including cups, any ideas?

[Brucey]

weight weenies is good.

Shimano usually specify weights and many vendors (eg SJS) give this info on their website.

cheers

[Hackfall]

weight weenies is not current, and SJS does not have 105 weights. But that said I am looking at weight weenies anyway and making a leap of an assumption that probably there is about 100g difference between the 105 and ultegra. Until now upgrading my chainset brought no significant weight saving, but going to ultegra could save me at least 350g. This combined with a recent wheel upgrade would bring my summer 631 down from 9kg to 8.3kg. It would be nice to get that little bit further to sub 8kg but there is nowhere to really shave off the 50/100g amounts without spending proportionately silly amounts of cash.

[Brucey]

some info here;

http://forums.roadbikereview.com/components-wrenching/shimano-105-cranks-vs-ultegra%60-243600.html

generally if you type the model number (say) 'FC-5750 weight' into google you will get your answer in seconds.

BTW I like a light bike as much as the next fella (they can be delightful to ride), but unless you are racing, it doesn't make a significant difference in normal use (try riding the same loop with and without a 3lb weight strapped on the bike somewhere). Even if you are racing, it doesn't make that much difference.

Most folk (including myself for sure) could most easily reduce the all up weight by, uh, 'rationalising the power source...' so that is usually the best thing to concentrate on.

Also, if you want to go faster, get more aerodynamic. Over 20mph the chances are that 3/4 of all you effort is in pushing the air aside. Losing 10% off that will make you go faster again than losing a whole bike's worth of weight.

cheers

[Ayesha]

I looked at my SWorks before Christmas and thought "How do I get this from 7.35kg to 6.8 kg?"

I looked in the mirror.

Since I looked in the mirror, I have reduced the weight of the whole vehicle package by 7.5kg.

And it cost me diddly zip.

[Hackfall]

Have to disagree a little though yes for lots of people they can lose weight off themselves, I don't really have weight I can lose unless I live like a monk to achieve it, not something you can do with 3 primary age kids. I have noticed a difference in my hill climbing losing just my bike pump as the hills I tackle are steep and long. As mentioned before I would obviously avoid the relative expense of say spending £100 on a stem that saves 50g, but where its worth it and the equipment needs an upgrade anyway then why not?

[cycleruk]

I swapped an Ultegra triple to 105 triple and did do a measure at the time.
Unfortunately I can't find the weights but I do know that the 105 was a minimal bit heavier.
Certainly not worth the price difference at the time.
The reason I swapped was the Ultegra BCD 130/92 against the 105 130/74.
The 92 would limit the granny ring size if I wanted to go below 30T.

The other possible drawback with the latest Ultegra is the special outer ring that could be expensive to replace?
I don't know if you could fit a standard ring (cheaper) instead if it wore out.

P.S. Ribble have Ultegra "marked" ones on offer at the moment.

[Brian73]

The modern external bb chainsets with attached large diameter spindles offer greater stiffness but not much weight saving over the old stuff

My old 1055 chainset and square BB weighs in at 1kg which is about the same as my 105 5600 chainset with Hollowtech BB.

Ultegra has a hollow outer ring for added stiffness too.

The most weight you can save is generally on wheels and tyres.

[Hackfall]

This is what I found when I last looked into it Brian. The difference now seems to be that the Dura Ace technology has "trickled down" to Ultegra and the prices are not that bad. So I should be able to shave off 3-400g in a chainset upgrade whereas previously I stood to gain nothing. On really steep banks like Buttertubs near me, these marginal amounts actually do make a significant difference. It can be the difference between keeping the right cadence going or not, and also less fatigue over a longer hilly ride. The wheel and tyre part I already did with an upgrade to Campag Zondas and Conti 4000s tyres.

[willem jongman]

Remember, however, that chainsets with external bearings have real reliability issues compared to square taper.
Willem

[reohn2]

Remember, however, that chainsets with external bearings have real reliability issues compared to square taper.
Willem

+1

Hi Willem nice to here from you

[hamster]

If I remmeber correctly, RX100 has a steel inner chainring. Swapping that to aluminium with save you 100-200g straight away and only cost £20 or so.

[Hackfall]

thanks for the tip, i have already replaced the inner ring, it has a 39T off a Dura Ace Octolink chainset, can't say i noticed a weight difference in the two rings when I changed them but I wasn't checking at the time.

[easyroller]

I have noticed a difference in my hill climbing losing just my bike pump as the hills I tackle are steep and long.

What were you lugging around, a full sized steel track pump?!?!?!

The Ultegra cassette is lighter than 105, but by how much I do not know. I was going to say you could lose a few more grams off the cassette by going with a smaller geared one such as a 12-25 if you're running something bigger like a 12-28 105 at the moment, but then you mentioned hills!

You can get a lighter tyre than the (very good) Conti GP4000S, but you'll lose a good whack of puncture protection.

[Hackfall]

What were you lugging around, a full sized steel track pump?!?!?!
The Ultegra cassette is lighter than 105, but by how much I do not know. I was going to say you could lose a few more grams off the cassette by going with a smaller geared one such as a 12-25 if you're running something bigger like a 12-28 105 at the moment, but then you mentioned hills!
You can get a lighter tyre than the (very good) Conti GP4000S, but you'll lose a good whack of puncture protection.

My pump could be smaller, and maybe should look at changing that too, I think its about 250g which alone is noticeable on long 14% climbs.
I think the ultegra cassette is a little lighter, I have a tiagra, might save 100g there and seeing as the Ultegra cassette is about £30 its not a bad way to shave more weight off for small amount of money.
And as for the conti's they are so good in the wet and in terrible roads I think you are right I would need to compromise on weight slightly there to know I have a good puncture resistant tyre.