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?
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.
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.
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.
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
Specialized Tarmac S-Works Ultralight Rim 2018 weight 6.30 kg (56 cm)
Frame only 733g
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