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I was wondering if any one has an idea of how much more weight a larger size bike weighs. Specifically S-works Tarmac. So for example what would the difference in weight be between a 56 compared to a 61? 100g, 400g any idea?

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    Perhaps you could explain what possible difference it could make. Are you considering purchasing a mis-sized bike in order to shave 40 grams? – Daniel R Hicks Nov 3 '15 at 12:49
  • @DanielRHicks that's ok I am sure you can make a smaller frame fit with a 140 mm stem! No negatives on weight distribution or handling either. /s – Rider_X Nov 3 '15 at 13:38
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    I'd rather ride a 20 kilo gaspipe frame than a lightweight frame that is too small, at least after the first half-hour. – Criggie Nov 3 '15 at 20:31
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    The only sane reason most people are concerned with bicycle weight is it is easy to measure, quantitative value and makes a (arguably poor) proxy for quality, which is immensely hard to measure and subjective. Same model bike will have same quality no matter what the size, so weight is a pointless measure. – mattnz Nov 3 '15 at 20:41
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    The entire focus on weight is completely misguided: Even if you manage to shave 800g off a frame, that's only 1% of the total weight. (At best. I'd need to shave more as I'm not a 70kg fly-weight...) True, this makes it 1% harder to climb a mountain. However, you are mostly fighting air resistance on all other parts of your ride, and for that, weight is not even a factor. So, my advise: Forget about weight, and enjoy riding your bike! – cmaster Mar 16 at 8:04
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According to the Weight Weenies.com web site listed weight can differ from actual weight by as much as 10-13%. One thing you should be aware of is there is some variations between identical frames due to manufacturing tolerances. Most weights listed in advertising literature are not for large frame sizes. Looking at the listings on the site it appears that a 20-40 gram difference between carbon frame sizes is about the average.

  • Hey Mike, cheers. Where are you finding frame weight on the Specialized site? Can you provide a link? Cheers mate :) – Robaggs Nov 3 '15 at 11:24
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    You need to go to a bike shop and weigh them on a scale by yourself (e.g. with a fishing scale). – Batman Nov 3 '15 at 17:38
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    Weight Weenies in an independent site that has a data base of the actual weight members have submitted and compares this to the manufacturers published weights for frames, components and complete bikes. – mikes Nov 3 '15 at 20:57
  • Thanks mike I'm familiar with weight weenies. It's a good idea to look at the different frame sizes there. Thanks for your answer :) – Robaggs Nov 4 '15 at 8:52
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The important thing to remember is that on a modern road bike, the frame is actually a small percentage of the overall weight of the bike. This frame, including the fork, is advertised at 3 pounds, while a bike built on the frame weighs in at 16.69 pounds. The frame is only 18% of the weight of the bike. Even if the frame which was a bigger size weighed 20% more, It would only bring the weight of the bike up by 3.6%.

The weight for the above bike also includes the weight of the fork in the weight of the frame. Since the same fork is used for bikes of different sizes, the actual frame weight will contribute even less to the total weight of the bike. What mainly changes between different sizes is the size of the main triangle. I couldn't see the weight of 2 different frame sizes making up more than half a pound.

I would recommend buying the bike that actually fits the best. Weight doesn't make as much as a difference as you think, especially if you aren't competing at the top level.

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    Well, most people can't ride a 56 and 61 frame in the same model line comfortably, so the whole question is useless to begin with. – Batman Nov 3 '15 at 17:38
  • Actually I own a 61 road bike and a 56 cx bike. Both have enough in them to fit me perfectly. So your assumption is wrong. Take a look at pro cyclist, most of them ride very small bikes when they could fit on much larger sized frames if they desired. – Robaggs Nov 4 '15 at 8:48
  • @Robaggs, The two bikes you own are different models, so I don't think that really applies directly to the question. A frame of the incorrect size could be adjusted using the seat post and stem to fit different sized riders, but that doesn't mean it's ideal. Also, I personally try not to pay attention to what the pros do. What makes sense at that level of competition often doesn't apply to every day riders, even if they race competitively. – Kibbee Nov 4 '15 at 13:50
  • I agree @Kibbee, just getting annoyed at the off topic ranting going on. – Robaggs Nov 4 '15 at 20:04
  • @Robaggs Conversely, I was jut reading Phil Gaimon's book where he mentions that a sponsor gave him a custom-painted bike but he hardly ever rode it because it was too much hassle to get the 58 frame to fit, compared to all the set-up he'd done on his 56. (Granted, most "real-world" riders probalby aren't that fussy about exact set-up.) – David Richerby Mar 16 at 10:14
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This is a very good question. I recently bought a Specialized Tarmac. In the shop, I weighed the exact model that I wanted to get that happened to be a size 56. It weighed 14.3 lbs. I ordered my size, which is 61. When I got it, I weighed it and it weighed 16.3 lbs! Part of this was because I got disc brakes instead of rim brakes (the ONLY difference in components), which would add 285 grams, a little more than half a pound. I compared the frames side by side and the tubes on my frame are MUCH larger than on the small frame but I'm not sure how this could add that much weight.

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    Gidday and welcome to the site. Your answer starts well, but then veers off into chattiness. Do please have a browse of our tour which shows that its all about the question and its answers. Comments are ephemeral and exist to clarify and improve the Question and its Answers. Welcome to the site, and I look forward to your future contributions. – Criggie Jul 13 '17 at 5:19
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    I edited out the chat. Note also that clinchers are a kind of tyre (the sort that require an inner tube), not a type of brake. – David Richerby Jul 13 '17 at 12:03
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    Disk brakes put a LOT of stress both on the fork and on the rear stays (?) - maybe up to 10 times more than rim brakes. As such, the frame/fork must be a lot stronger. I remember in the early days of MTB frames with both disk and rim brake mounting options, failure of the rear stays with disk brake installed was pretty frequent (at least in discussions). Also, I'm not sure you've quantified both the extra weight of the brakes and of the brake levers. The wheel hubs might be heavier too - the braking torque goes through the hubs, spokes, rim and tires so there's extra tangential torque. – Calin Ceteras Mar 18 at 11:42
  • I've always found it odd that weight weenies are usually the first to jump on disk brakes. Disk brakes add a lot of weight, enough to actually be significant in some cases. – Daniel R Hicks Mar 18 at 11:56
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Weights are extremely hard to find - the manufacturer doesn't seem to publish them directly, just making statements like "x00 grams lighter than last year's"

Full bikes offered to reviewers seem to ALL be 56 cm. I cannot find a review that mentions weight that is for any other frame size.

Reviewers don't review bare frames. I think you'll have to try contacting Specialized directly, OR try to get in contact with the distributor for your country/region.


Collected results data points:

s-works disc 2019 dura ace di2 and roval wheels - Weight 6.69 kg (56 cm)
Frame only 800g
s-works rim 2019 dura ace di2 and roval wheels - Weight 6.38 kg (56 cm)
Frame only 733g
from https://granfondo-cycling.com/review-specialized-s-works-tarmac-disc/

Specialized Tarmac S-Works Ultralight Rim 2018 weight 6.30 kg (56 cm)
Frame only 733g
from https://granfondo-cycling.com/review-new-specialized-tarmac-s-works-ultralight-2018-visionary-bike/

Many statements here but not a lot of detail about exactly what frame size people have weighed. Take it with salt: https://weightweenies.starbike.com/forum/viewtopic.php?t=154296

  • This is a sub-optimal answer - It really needs a frame weight for a 54 or a 58 cm frame to compare to the given 56cm frame. – Criggie Mar 19 at 7:50

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