suburbanreuben
Old School Grand Master
drcarlos":1jxy5mt0 said:NeilM":1jxy5mt0 said:Lots of different stories about 653, but this is what Terry Bill (ex-Reynolds) said:
"653 - superseded 531 pro, consists of 531 lightweight main tubes, 725 rear stays (725 is CrMo and similar in characteristics to 753)"
Funny Reynolds constructors tube guide lists it as being a MnMo tubeset like 753 and 531 with the same diameters as 753 on the stays.
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http://www.equusbicycle.com/bike/reynolds/Reynolds-tubing-sizes.jpg
and I've seen that thread too but the interesting bit is:
The Reynolds timeline shows 725, 631, and 525 tubing were introduced for OEM use in 1997, while 753 was introduced nearly 20 years earlier in 1976.
The decals history pdf shows the 653 decal as having been available in 1986.
So I think the details maybe hazy in that employees head as 725 didn't even exist when 653 was launched.
Good old Wikipedia seems to state the same as does this blog post citing evidence directly from Reynolds:
http://jimlangley.blogspot.co.uk/2008/03/q-merckx-tubing-motobecane-badge-pedals.html
The main difference between 653 and 753 is in the heat treatment. The ratios of Mn:Mo and any other elements may also be different.
Having the same dimensions does not necessarily make them the same.