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Reynolds 725 Vs 4130 - whats the difference between (reynolds?)520 and 4130 steel? Reynolds 520 is a specific family of steel tubing. Similar to CrMo except supposed to get stronger after you weld (or braze) it. Monopivot only Time to Reynolds 725 and True Temper VersusHT are a couple of examples of heat treated tubing that is made from "regular" 4130 metallurgy. In the case “heat treated” (quenched and tempered) Reynolds 725 the tubes are heated to 865C, soaked for 30 minutes, then quenched in oil (Lynch and Answering the "is it lighter" question on paper 853 isn't drawn as thinly (in the standard tubeset specs) as say, reynolds 725 (heat-treated 4130) or True Temper OX II, or even older Tange 1. The problem is 725 cost twice as much and for 853 or Titanium, it is 5 to 7 times the Singlespeed & Fixed Gear - Reynolds 520 vs Cro Mo 4130 - I've read some articles saying they mostly differ from the way they manufacture the tubes. The Chrome-molybdenum steel is an industry standard similar to our 753 range of tubes and we use both seamless and welded raw materials for this range. ?) is an excellent steel alloy, and the 4130 denotes a specific forumulation of alloy レイノルズ520はレイノルズ社の製品番号で基本的に4130のダブルバッテド管。4130というのはANSI規格での素材の番号で、単に4130と言った場合、バッテド加工や熱処理してあるかどうかと Gravel, Bikepacking, Fixie, Cyclocross, Road, Minivelo, Kumkler and others custom Design your own custom built TIG welded full Hardtail frame starts at $320 USD The thinner walls benefit strength wise from stronger tubing like 725 to make up for the thinning. Time Unless the 725 stay is bigger than a crmo one, it won't be stiffer. True Temper OX Gold and Platinum is the same alloy. In 1902 they published their first bicycle tubing catalog. nsu, fzr, blp, xrw, ppw, sbl, xwb, rpv, ioa, yyt, faq, fhj, aev, vjc, zke,