forteh Posted June 3, 2008 Report Share Posted June 3, 2008 (edited) Ok so I know the topic has been covered before in the last 6 months or so but figured I wouldnt rebump and old thred Just got some 221PR bars from owen with the intention of extending them - was going to go for the ben travis technique tm(stolen from aliC technique tm) of hammering wooden dowel in and building it up with tape. Being an engineer I figured I should at least try to do it properly and get the extenders machined to a push fit into the bars so theres no step under the grips - checked it all out with the guys in our machine shop and they said no problems doing (they wont let me use the machines boo! ) Got the bars this morning and dropped them off at lunchtime, just collected them with +50mm delrin inserts either end so I now have 780mm monty bars woo ! Built-in indestructable bar plugs (almost died because normal plastic ones are weaker than skin and muscle ) and I can always chop them down Hopefully the weather stays dry tonight to try them out, theyve got some fair sweep on them Edited June 3, 2008 by forteh Quote Link to comment Share on other sites More sharing options...
ogre Posted June 3, 2008 Report Share Posted June 3, 2008 any chance of mass producing + selling? Quote Link to comment Share on other sites More sharing options...
forteh Posted June 3, 2008 Author Report Share Posted June 3, 2008 any chance of mass producing + selling? Myself? Not really, however the concept isnt particularly challenging, just need some 7/8" delrin bar and a lathe In this instance it was turned down from 1" stock as thats all we had to hand. Mass production wouldnt be so easy as you couldnt universally design them as pure hammer in plugs because in the variation in wall thickness/ID between manufacturers However RS sell nylon bar stock over their trade counters, talk nicely to someone with a lathe and a spare 5 mins and youre sorted for the cost of a pint or 2. Quote Link to comment Share on other sites More sharing options...
ben_travis Posted June 3, 2008 Report Share Posted June 3, 2008 was going to go for the ben travis technique tm of hammering wooden dowel in and building it up with tape. I will not take credit for this as it is actually the ALI C technique tm, which i stole and decided was a brill idea cos im a cheap skate. your extenders look pretty darn sweet min let us know how u get on, however i cant see there being any problems Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted June 3, 2008 Report Share Posted June 3, 2008 Looks good dude, that shit is WIIIIIIIIIIIIIIIIDE! Quote Link to comment Share on other sites More sharing options...
forteh Posted June 3, 2008 Author Report Share Posted June 3, 2008 Looks good dude, that shit is WIIIIIIIIIIIIIIIIDE! Figured its better to go wide and cut down if needed Not very tall but pretty wide shoulders, will probably just get used to them. Quote Link to comment Share on other sites More sharing options...
walker Posted June 3, 2008 Report Share Posted June 3, 2008 couple of questions.... how far into the bar does the insert extend (crucial for strength and stiffness without being too heavy)? Are they drilled out through the middle? and if so, what diameter hole (obviously it is closed at one end as your bar plug)? How heavy are they in total? cheers, Andrew Quote Link to comment Share on other sites More sharing options...
forteh Posted June 3, 2008 Author Report Share Posted June 3, 2008 couple of questions.... how far into the bar does the insert extend (crucial for strength and stiffness without being too heavy)? Are they drilled out through the middle? and if so, what diameter hole (obviously it is closed at one end as your bar plug)? How heavy are they in total? cheers, Andrew Theyre inserted 50mm into the bars and extended 50mm. Solid all the way through, Im not bothered about a couple of grammes Roughly, theyre 39g each, could be made lighter if you hollowed them, but as I said Im not particularly bothered about weight. They are heavier than having the bars full width to start with, its only a matter of 10g each though. Quote Link to comment Share on other sites More sharing options...
walker Posted June 3, 2008 Report Share Posted June 3, 2008 cool, good job, might have to make me some of them, but they might be out of aluminium so they could be drilled out fairly thin. Definitely not as wide as yours though!! Andrew Quote Link to comment Share on other sites More sharing options...
forteh Posted June 3, 2008 Author Report Share Posted June 3, 2008 cool, good job, might have to make me some of them, but they might be out of aluminium so they could be drilled out fairly thin. Definitely not as wide as yours though!! Andrew Personally I would be alittle wary of doing them from aluminium unless its fairly thick at the point where the end of the normal bars are, any thin sections at that point are going to be subject to alot of fatigue If you really want to go to town then you could machine a hollow delrin plug and reinforce it with some thin wall aluminium tube. The width is purely a starting point, Im not saying its the right size, in theory if you only extend the plugs 20mm then you only need 20mm or so inserted which would equate to about 16g each when solid Quote Link to comment Share on other sites More sharing options...
forteh Posted June 3, 2008 Author Report Share Posted June 3, 2008 Been out for a few hours tonight with the new bars and the ride of the bike has transformed Bars tips are now 2" higher at 41.5" with much more upsweep and alittle more back. The bike has become much more floaty as a result and balancing has become alot easier - Im currently really loving the wide bars Quote Link to comment Share on other sites More sharing options...
TheMunn Posted June 3, 2008 Report Share Posted June 3, 2008 I'm a metal worker and made some bar extenders from alu for my bmx. Work wonders and only took 5 minutes to make. I would have made the insert a little longer though if you've got 50mm outside the bar, mine are double the length inside to out. Quote Link to comment Share on other sites More sharing options...
Mark W Posted June 3, 2008 Report Share Posted June 3, 2008 I'd keep an eye on the bars for cracks if I were you - all the wide bars (29"+) I've had have cracked relatively quickly compared to the narrower ones. I'm guessing they're not super keen on the additional leverage... Quote Link to comment Share on other sites More sharing options...
forteh Posted June 3, 2008 Author Report Share Posted June 3, 2008 I'm a metal worker and made some bar extenders from alu for my bmx. Work wonders and only took 5 minutes to make. I would have made the insert a little longer though if you've got 50mm outside the bar, mine are double the length inside to out. Most of the weight is taken on the joint between the 2 parts at most, its pretty sturdy and shouldnt move. The great thing about plastics is that they creep rather than failing quickly like work hardened aluminium I'd keep an eye on the bars for cracks if I were you - all the wide bars (29"+) I've had have cracked relatively quickly compared to the narrower ones. I'm guessing they're not super keen on the additional leverage... Duly noted Im not what could be considered a big rider, dont do big drops or gaps to front (read that as cant ) and generally try to be smoother on smaller stuff than balls out harsh on bigger stuff. Will keep an eye on them though. In reality Im only really using 25-30mm extensions as my hands arent at the outside of the grips. Quote Link to comment Share on other sites More sharing options...
strelly Posted June 3, 2008 Report Share Posted June 3, 2008 I just extended my monty bars in the workshop yesterday... weird! I used aluminium though, and drilled nice big holes through them. I think i have extended a little less than you (45mm each end), they look a bit comedy-wide but feel really nice to ride!! Good job Charlie Quote Link to comment Share on other sites More sharing options...
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