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Post by icarus001 on May 28, 2013 8:21:04 GMT 1
Obviously the cheapest thing to do is stay away from the biscuit barrel ;D
But I'm only 70kgs (down from 80kg since I started boxing again) if I lose anymore weight I'll disappear.
I'm talking about the LC, and specifically about unsprung weight.
I had the wheels off my bike and was staggered at the weight of them, especially compared to my Talon carbon hub motocross wheels.
So whats the obvious answer to reduce unsprung weight without swapping the forks and swingarm to take RGV wheels?
I'd possibly drop TZR forks and wheel in but I'd like to keep the standard swingarm really....will a TZR rear wheel fit if I make spacers? In fact will TZR wheels fit the standard forks with the right diameter spacers for the spindle?
And has anyone had spoke wheels made? I fancy some Talons but specially made ones will cost a packet I imagine. My carbon hub ones cost £1200.
I know from past experience that reducing unsprung weight has a massive effect, its worth an engine tune at least, it makes the bike feel like its just had 15bhp added and with the extra benefit that it handles loads better too, not to mention the brakes feel miles better because its easier to stop the reduced rotating mass.
Any ideas?
I'm leaning towards spoke wheels with a single TZR250 disk up front and smaller motocross disk on the back - just need to work out how to mount it on the standard swingarm.
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Post by Norbo on May 28, 2013 8:32:36 GMT 1
I have TYZR2502ma whells and forks on my LC and they are grate not to wide and a lot lot lighter
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Post by reggieperrin on May 28, 2013 8:46:59 GMT 1
Hi Icarus When racing in MRO minitwins and thunderbikes there was little that I could do in the way of tuning but weight saving was allowed and made a hell of a difference. As well as having the lightest wheels allowed and taking off all that was unnecessary on the bike I started to get really into cutting the weight off. I was lucky to be sponsored by Pro-Bolt and every fastener on the bike was either Titanium or Alloy with the only steel being those things determined by the rules such as spindles etc. Many of my mates thought I was obsessed but I presented them with a bag of assorted nuts and bolts taken from just the front end of the bike and the corresponding parts in Titanium and they were shocked at the difference. Just compare disc bolts on their own and you'll be amazed... As you rightly said, this is unsprung mass but also a rotating mass that has to be accelerated and decelerated, it has rotational mass that will effect the steering response plus it has an effect on the brake force available through the race etc. etc. The other relatively heavy element is the wiring loom and making a custom loom for the SV saved loads. OK, so it was a carbed bike which is easier but the whole loom was just 8 wires and a fuse and ran a 3 amp hour battery instead of a 12ah one. Saving weight is an incremental thing that has a cumulative effect. you can always make a bike lighter. One of my friends also used to take the grinder to any length of bolt that was left beyond a thread...! When finished and ready to race my SV in thunderbike trim weighed in at 142KG which is a hell of a weight saving over stock... Sorry for the ramble but weight saving was a massive thing for me, mainly because I'm over 6 foot and weigh 14 stone and in a horsepower limited series it made a hell of a difference when racing against 7 stone teenagers...  Reggie |
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Post by icarus001 on May 28, 2013 9:22:09 GMT 1
I have TYZR2502ma whells and forks on my LC and they are grate not to wide and a lot lot lighter Does the rear fit in the standard swingarm, or is it a TZR250 swingarm as well? |
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Post by icarus001 on May 28, 2013 14:38:46 GMT 1
Hi Icarus When racing in MRO minitwins and thunderbikes there was little that I could do in the way of tuning but weight saving was allowed and made a hell of a difference. As well as having the lightest wheels allowed and taking off all that was unnecessary on the bike I started to get really into cutting the weight off. I was lucky to be sponsored by Pro-Bolt and every fastener on the bike was either Titanium or Alloy with the only steel being those things determined by the rules such as spindles etc. Many of my mates thought I was obsessed but I presented them with a bag of assorted nuts and bolts taken from just the front end of the bike and the corresponding parts in Titanium and they were shocked at the difference. Just compare disc bolts on their own and you'll be amazed... As you rightly said, this is unsprung mass but also a rotating mass that has to be accelerated and decelerated, it has rotational mass that will effect the steering response plus it has an effect on the brake force available through the race etc. etc. The other relatively heavy element is the wiring loom and making a custom loom for the SV saved loads. OK, so it was a carbed bike which is easier but the whole loom was just 8 wires and a fuse and ran a 3 amp hour battery instead of a 12ah one. Saving weight is an incremental thing that has a cumulative effect. you can always make a bike lighter. One of my friends also used to take the grinder to any length of bolt that was left beyond a thread...! When finished and ready to race my SV in thunderbike trim weighed in at 142KG which is a hell of a weight saving over stock... Sorry for the ramble but weight saving was a massive thing for me, mainly because I'm over 6 foot and weigh 14 stone and in a horsepower limited series it made a hell of a difference when racing against 7 stone teenagers... Reggie Never bothered with bolts but you might have a point there. I'll look for wheel builders and see what I can come up with, there has to be some pretty serious savings from ditching the standard LC wheels, I can't believe how heavy they are. |
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Post by midlifecrisisrd on May 28, 2013 15:23:37 GMT 1
alext on here has an fzr wheel in the standard swinger
page 2 in the rebuilds section
Steve
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Post by billy on May 28, 2013 15:41:08 GMT 1
I'm in the very slow (pretty much stalled) process of making a 125 racer. I have a thread here: rdlccrazy.proboards.com/index.cgi?board=hybridchat&action=display&thread=13448&page=1(Edit: Oh crap, I just realised I havn't done ANYTHING to it in 1 year and 2 days. I have to resuscitate the project.  ) My aim was to get it as light as possible without sacrificing stability, so the frame has had LOTS of unnecessary brackets cut off. I wanted to cut the subframe too, but so far I havn't found a way to build a new subframe/seat unit so that it looks good. I'll find a way lol. According to my calculations, if I make a custom subframe/seat unit and REALLY go all the way with the weight saving (no inner muddy, battery & box etc, NOTHING unneccessary junk on it) it would have a dry weight of about 70 kg, and you can still add far lighter rims on it. Give it a bit of tuning (not anything extreme, just a pipe, more or less) and at that point it would have a power to weight ratio similar to that of a stck 350!  It won't be as fast though, as the 350 engine simply has more power which you will need when reaching higher speeds, but it would definitly keep up to somewhere around 100 km/h (that's my guesstimation). |
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matt7
Thrash Merchant
Smell of the 2 stroke & the roar of the crowd
Posts: 445
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Post by matt7 on May 28, 2013 17:40:25 GMT 1
Icarus, if you want to get spoke wheels built, I've got a pair of GS750 hubs (still attached to 19"/18" steel rims) - double disc fr hub, disc rear, 36 hole front from memory. piddly little spindles too !
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Post by Norbo on May 29, 2013 8:36:35 GMT 1
I have TYZR2502ma whells and forks on my LC and they are grate not to wide and a lot lot lighter Does the rear fit in the standard swingarm, or is it a TZR250 swingarm as well? It has a Metmachex swinger fitted |
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