I'll start the thread again..
1) Is the standard TRX shock worth rebuilding - is there anything that can be done to make it better than OE?
2) Are there any other bikes shocks which will fit ? I was bidding on an Ohlins to suit a ZX7R the other day and the dimensions were identical to the TRX's with the exception of one of the mounting bolts being 12mm instead of 10mm and the shock's bottom mount was a couple of mm wider (but that's what washers are for innit?). I bottled out at £160 and it went for £165 in the end, I'm wondering if I should have been more bold! Having read previous postings, YZF750 and 600's will go, but there must be others - surely?
G
More shocking questions..
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Greg
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More shocking questions..
Brake cleaner makes me smile...
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phuk72
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1) depends on how you define worth it. IMHO yes. Getting a spring matched to the way you ride and how much you weigh is important and new oil / gas will transform any shock. That said, it'll cost you probably £150 but it will be like a new shock.
2) Any shock can be made to fit
YZF750 bolts straight in and I've ben told a ZX6 is an easy mod. I'd get in contact with a friendly shock manufacturer (Hagon are always helpful) and tell them you are building a special and need a shock to fit (and then give them the TRX specs and see what they come back with).
The downside to this is that you could end up buying a shock which is in worse condition that the one you are replacing and that needs a £150 rebuild (ask yourself why you are swappig yours).
If it was me, I'd either buy a shock with a known history (eg a mate who races who has used teh shock for a few races), rebuild or buy new
2) Any shock can be made to fit
YZF750 bolts straight in and I've ben told a ZX6 is an easy mod. I'd get in contact with a friendly shock manufacturer (Hagon are always helpful) and tell them you are building a special and need a shock to fit (and then give them the TRX specs and see what they come back with). The downside to this is that you could end up buying a shock which is in worse condition that the one you are replacing and that needs a £150 rebuild (ask yourself why you are swappig yours).
If it was me, I'd either buy a shock with a known history (eg a mate who races who has used teh shock for a few races), rebuild or buy new
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trixynut
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Greg,
I agree with all Phukey says and would add the following:
As the originator of the Shocking thread below, and having looked at the responses I got and looked into this topic a bit recently, I figured out the following:
1. Price range is about £300 for Hagon, through to £700 for Ohlins or WP, with Nitron, Maxton, Penske etc somewhere in between.
2. Nitron at oxford were helpful, and would build-to-order in about 3-4 days for around £420. Hagon are stocked by several people. Most of the others are 'special order' from the manufacturers.
3. Rebuild prices (new spring, gas, oil, seals) is about £150 to £200 but I found it hard to find someone who'd give me a firm price/wanted the job!
4. If you find the Ohlins or any other manufacturers part number for the TRX shock, and then google it, you'll find out what else it directly fits without any arsing about (from memory I think the ohlins would also directly fit the YZF750 and a Triumph, maybe old speed triple?)
5. It's difficult to know when your shock has gone bad cos it goes slowly over time, not suddenly, and you can't "see" the wear like you can for say dirty oil or worn tyres. You only know how bad it was when you try a refurbed/new one on the same bike for comparison. My bike's done 17k miles so I figured it must be due a refresh. I ended up finding a Hagon unit I got second-hand with a known history.
6. The standard unit is not inherently bad: most opinion says it may be a bit 'overspring' but if it's refurbed and a spring put on to suit your weight (with leathers etc) and riding style, it should come back better than OE.
Good luck buddy!
Dave.
I agree with all Phukey says and would add the following:
As the originator of the Shocking thread below, and having looked at the responses I got and looked into this topic a bit recently, I figured out the following:
1. Price range is about £300 for Hagon, through to £700 for Ohlins or WP, with Nitron, Maxton, Penske etc somewhere in between.
2. Nitron at oxford were helpful, and would build-to-order in about 3-4 days for around £420. Hagon are stocked by several people. Most of the others are 'special order' from the manufacturers.
3. Rebuild prices (new spring, gas, oil, seals) is about £150 to £200 but I found it hard to find someone who'd give me a firm price/wanted the job!
4. If you find the Ohlins or any other manufacturers part number for the TRX shock, and then google it, you'll find out what else it directly fits without any arsing about (from memory I think the ohlins would also directly fit the YZF750 and a Triumph, maybe old speed triple?)
5. It's difficult to know when your shock has gone bad cos it goes slowly over time, not suddenly, and you can't "see" the wear like you can for say dirty oil or worn tyres. You only know how bad it was when you try a refurbed/new one on the same bike for comparison. My bike's done 17k miles so I figured it must be due a refresh. I ended up finding a Hagon unit I got second-hand with a known history.
6. The standard unit is not inherently bad: most opinion says it may be a bit 'overspring' but if it's refurbed and a spring put on to suit your weight (with leathers etc) and riding style, it should come back better than OE.
Good luck buddy!
Dave.
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youngy
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trixynut
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Greg
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Cheers chaps ...
well, I think my shock is proper phucked as the last inch or so of rebound is completely undamped. One of the guys I met in Avebury (The wheelie king!) upped the preload and wound the compression damping up to max which helped a lot but just highlighted how bad the problem was...
A friend of a friend owns Falcon Shocks in Wareham so I should be able to get the original shock rebuilt quite cheaply (he did my old XR250R shock a couple of years ago - re-oiled, re-gassed and re-sealed for less than £60 ) so that might be my option ...
G
well, I think my shock is proper phucked as the last inch or so of rebound is completely undamped. One of the guys I met in Avebury (The wheelie king!) upped the preload and wound the compression damping up to max which helped a lot but just highlighted how bad the problem was...
A friend of a friend owns Falcon Shocks in Wareham so I should be able to get the original shock rebuilt quite cheaply (he did my old XR250R shock a couple of years ago - re-oiled, re-gassed and re-sealed for less than £60 ) so that might be my option ...
G
Brake cleaner makes me smile...
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youngy
Mebbe...............TRX shock is 348mm long. YZF750 is 340mm.trixynut wrote:So would this be cancelled out by also fitting the YZF dogbones which, on their own, raise the rear ride height?The YZF750 shock fits but is slightly shorter than the TRX unit.
....could alter the whole geometry of the rear suspension though...?
If you had an aftermarket shock with a ride height adjuster you could adjust this out. 750 dogbones may well achieve the same result.
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HansJ
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Just to convince You, I agree totally with the others, either rebuild Your OEM or buy a completely new shock, and not one from the shelf, but one that has been adjusted for You and Your driving style. I had my OEM rebuilt two years ago, night and day... Around 150 £ sounds about right, but money well spent.
IQiokW
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youngy
ThunderArse shock is the same enough as YZF750 so an Ohlins or other aftermarket from that will be fine.
I picked up a YZF750 Ohlins shock for £120. Have to get it cleaned up, revalved, resprung etc but should have it on the bike for £250.
Only thing is it has no ride height adjuster, and as it's a bit shorter than the OE shock I'll need some shorter links.
The Ohlins for the ThunderArse has a ride height adjuster, so the difference in length can be adjusted away.
Going back to the earlier discussion about links etc, it may well be that the relay arm is a different size, so YZF750 links may not compensate fully for the difference in shock length.
I picked up a YZF750 Ohlins shock for £120. Have to get it cleaned up, revalved, resprung etc but should have it on the bike for £250.
Only thing is it has no ride height adjuster, and as it's a bit shorter than the OE shock I'll need some shorter links.
The Ohlins for the ThunderArse has a ride height adjuster, so the difference in length can be adjusted away.
Going back to the earlier discussion about links etc, it may well be that the relay arm is a different size, so YZF750 links may not compensate fully for the difference in shock length.
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phuk72
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youngy
No.
The YA420 for the 750R has no ride height adjuster.
http://www.ohlins.com/Portals/0/product ... /YA420.pdf
The YA421 for the 750SP has the ride height adjuster.
http://www.ohlins.com/Portals/0/product ... /YA421.pdf
The YA420 for the 750R has no ride height adjuster.
http://www.ohlins.com/Portals/0/product ... /YA420.pdf
The YA421 for the 750SP has the ride height adjuster.
http://www.ohlins.com/Portals/0/product ... /YA421.pdf