- Difference between Sora and Tiagra chainset?
I need a new chainset for my CX bike – the Tiagra 4500 that was on there has been fine and I’d happily enough replace it with the same but I’ve spotted a Sora HT2 chainset for £30 which looks pretty much identical. I suspect that the rings will be cheaper but I can live with that but wondering if anyone knows if they’re the same otherwise (a la Campag where several models have the same cranks with different rings)
Tiagra FC4550Posted 4 years ago
Aha! Shimano says that sora is ‘painted’. How’s that holding up?Posted 4 years agowobbliscottMember
Nothing ultimately. I bought a 2010 sora equipped bike in the sales in early 2011. I pondered over spending another few hundred quid on a tiagra equipped bike, but then I was informed that the 2011 sora was the 2010 tiagra flowed down the range and re-branded, and sure enough when you compared the 2011 tiagra with 2010 sora they looked identical visually save for a couple of very minor aesthetic details. The sora works fine, shifts smoothly and quickly, is reliable, does what it says on the tin. i doubt you’d notice any difference with tiagra, or even 105. I really couldn’t justify spending more on the groupset. Buy your bike based on frame and wheels.Posted 4 years agoesher shoreMember
quite noticeable difference in weight and stiffness, if you care about that kind of thing
got sora in 1 x 10 on my commuting bike
got tiagra in 2 x 10 on my road bike
the sora are not true “Hollowtech” cranks in that they do not have the forged hollow 2-piece construction used on tiagra and above.
The Sora are just a single lump of forged alloy with the rear of the arms scopped out
the Tiagra are proper Hollowtech with the hollow arms which reduces weight and improves crank stiffness
whether that is worth the money? for a commuting bike perhaps not? for a sports bike then yes?Posted 4 years agostumpy01Member
I stuck the Sora chainset on my bike at the weekend.
The BB cups were really tough to get in. Much harder than normal & the thread quality looked rubbish. But, they went in.
The Sora chainset was just over 1/2lb lighter than the one that came with the bike; not massively surprising, given the original is sq taper.
But a nice weight saving all the same for £36 (incl. a new 14mm socket I had to buy) and it looks better than the old one.
Will probably get most of that back once I stick the original on ebay; pretty sure there’ll be a sq taper fan who will snap it up.Posted 4 years ago
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