Sponge Posted June 4, 2007 Report Share Posted June 4, 2007 (edited) . Edited October 29, 2014 by Sponge Quote Link to comment Share on other sites More sharing options...
Sponge Posted June 5, 2007 Author Report Share Posted June 5, 2007 (edited) . Edited October 29, 2014 by Sponge Quote Link to comment Share on other sites More sharing options...
Heatsink Posted June 5, 2007 Report Share Posted June 5, 2007 For answers I'd phone up Reynolds:Reynolds tubes, Tel: 0121 7065151 - they're based in Birmingham. This number was the last one I used.From my experience they may not be able to answer all your questions though.Steve Quote Link to comment Share on other sites More sharing options...
Rusevelt Posted June 5, 2007 Report Share Posted June 5, 2007 Reynolds tubing has a better weight-to-strength ratio than 4130, as close to titanium as you can get. dont reckon you need 725 to construct a custom uni-cycle rig as 500 plus series Reynolds is good enough strength wise with the extra benefit of lighter weight than 4130. Clive Leeson is probably the best man to speak to about which reynolds tubing is ideal for style of uni-trials. T45 would only be good for doing monsterous drops. Alu is only good for comp use. hope that helps. Quote Link to comment Share on other sites More sharing options...
dave85 Posted June 5, 2007 Report Share Posted June 5, 2007 Reynolds tubing has a better weight-to-strength ratio than 4130, as close to titanium as you can get. dont reckon you need 725 to construct a custom uni-cycle rig as 500 plus series Reynolds is good enough strength wise with the extra benefit of lighter weight than 4130. Clive Leeson is probably the best man to speak to about which reynolds tubing is ideal for style of uni-trials. T45 would only be good for doing monsterous drops. Alu is only good for comp use. hope that helps.Im intriegued, can you justify that lot? T45 would make perfect sense to me, it isnt fussy about how it's treated during construction, and isnt butted. Given the abuse trials unis seem to go through, plain gauge tubing would be good. Quote Link to comment Share on other sites More sharing options...
Heatsink Posted June 5, 2007 Report Share Posted June 5, 2007 Here's a summary table I knocked up in an earlier thread. It goes to show that it's always a good idea to challenge opinion on material properties, move from subjectivity to objectivity. The actual figures may surprise you!Check out the Stiffness/Weight ratio column for example, amoungst others.In the absence of solid info (that I could find) on the reduction in strength from various heated joining methods for the full list of steels I was researching, T45 which is apparantly unweakened when exposed to the heat levels commonly used, had an enduring appeal.On the subject of Steel in frames, I did make an interesting observation the other day. Whilst you can choose the geo tubes to suit a steel construction (smaller OD than an Alu equivalent to give acceptable strength and weight), you can't change the tubing sizes of the BB and Headtube. So when working in steel you have to be aware of the possibility of higher stress risers than in an equivalent Alu construction (larger tubes) due to larger step up/down size between the tubing at joins.Steve Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted June 5, 2007 Report Share Posted June 5, 2007 (edited) strength to weight ratio is dependant on the application, however...IE: it's not always a linear yield strength/density relationship..EG: page 10 onwards article..not tekint piss heatsink...tis a damn good table that!people underestimate these things though..EDIT: but in the case of a unicycle...it is predominantly uniaxial loading..in which case the linear relationship is valid Edited June 5, 2007 by ad101 Quote Link to comment Share on other sites More sharing options...
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