When I placed my frame order canti brakes went on the order to permit 32mm tyres, afterwards I remembered about the relatively recent Tektro R556 55-73mm dual pivots - don't think Mercian had seen these before, anyway I got a pair from the US and sent them up to Mercian - John at Mercian seems to think they look good so that's what is being used.
Apparently Rivendell in the US were instrumental in persuading Tektro to make them.
Mine are Allen key fitting but SJS are now stocking a nutted version - good for old 27" frames!
Mercian Vincitore Special on Order - 631 or 853
AFAIK - 531 & 753 were a manganese/molybdenum alloy, 725 and 853 are new generation heat treated chrome molybdenum. 953 is different altogether & it's playing with semantics as to whether it's actually steel at all due to the low carbon content. 725's a nice ride, we have 2 of those.
If at first you don't succeed - cheat!!
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ricardolamos
- Posts: 110
- Joined: 16 Jan 2007, 1:45pm
853 v 725 v 631
Have a look at the Reynolds website as it gives a good overview of the relative merits of the different tubesets.
853 has the highest tensile strength and should therefore be stiffer for a given thickness whilst 725 is the NEW 753 and is easier to weld.
853 has the highest tensile strength and should therefore be stiffer for a given thickness whilst 725 is the NEW 753 and is easier to weld.
Re: 853 v 725 v 631
ricardolamos wrote:...853 has the highest tensile strength and should therefore be stiffer for a given thickness...
Bzzt! Incorrect! The stiffness will be the same if the tubes are the same diameter and thickness.
Sorry, couldn't resist.