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Originally Posted by
rpenmanparker
Even if you figure the very low weight of 150g for an added-on seat post (Thomson Masterpiece is 158g) you save 100g or so with the ISP approach. That's a fact which might not matter to you. Fair enough. But it is a fact. Yes, other makers may offer lighter frames without ISP. Just saying that if you choose the Giant TCR Advanced SL, you save weight with the ISP version. Like I said, two kinds of people. No use arguing about it.
Actually if you look at actual seat post weights, 250 isn't unrealistic. Weight weenies chart list actual weights and 250 is slightly more than average. What's interesting is even Thomson is closer 190 than 150.