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ninoBFU |
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sickpup |
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sickpup |
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temeluchus |
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temeluchus World Chat Champion
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sickpup |
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Carvel |
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sickpup |
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lozzypop1 |
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temeluchus |
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temeluchus World Chat Champion
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ninoBFU |
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lihp |
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kestrel |
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kestrel Nearly there...
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Vincent |
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Vincent Banned
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Posted: 11:45 - 25 Apr 2014 Post subject: |
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Aye...you need to get the geometry right otherwise you'll kill yerself
You have to bear in mind that you're trying to fit forks from a twin spar type frame onto a cradle frame - both employ different geometry, to do it right, you will probably need to think about fitting rear monoshock suspension, and all the joys involved, to match the front end.
As for the height issue, I was going to suggest a stepped yoke too......it won't make up the 5 inches but it will give you an extra couple of inches ground clearance.
Wether or not you can find one the right size is a different matter and it'd be a game fitting straight bars too........but it would be cheap.
i've known lots of bikes that have been built that have looked good.....but won't go around corners. A mate of mine spent years building a chopper that looked great, but when you sat on the bike, the front end was so high that you couldn't see the road ahead It's a "Form over Function" thing. Personally, I'd rather have a bike that looked shit but went around corners well .........than one that looked great but was crap to ride.
Stinkwheel had the best idea......find out what works from people that have changed the front end on this particular bike....and use that. Let others do the hard, expensive work ____________________ Space Is Deep |
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sickpup |
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sickpup Old Timer
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Vincent |
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Vincent Banned
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Posted: 12:53 - 25 Apr 2014 Post subject: |
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sickpup wrote: | Vincent wrote: | You have to bear in mind that you're trying to fit forks from a twin spar type frame onto a cradle frame - both employ different geometry, |
Please explain why you think different frame types necessitate different geometry?
I realise the bikes will have different geometry but that isn't what you are suggesting.
Vincent wrote: | Stinkwheel had the best idea......find out what works from people that have changed the front end on this particular bike....and use that. Let others do the hard, expensive work |
That would be getting longer stanchions made up considering the work of fitting the front end is already done. Unsure why this is confusing so many people? |
As the twin spar frame doesn't need to surround the engine.....above and below....it means everything can sit lower to the ground and the engine further forward. Obviously, this has an effect on everything else - suspension, wheel size, headstock height, rider position....etc, etc. Probaly why OPs forks are too short.....nein?
If you're going to alter the geometry of a bike, personally, I'd prefer to keep some things as they were originaly....project bike or donor bike.....mixing the rear suspension from a twin shock duplex framed bike with the front end from a twin spar monoshock bike, may create problems, with the geometry. 'Only a thought. ____________________ Space Is Deep |
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Vincent |
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Vincent Banned
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ninoBFU |
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ninoBFU Two Stroke Sniffer
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sickpup |
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sickpup Old Timer
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Posted: 13:20 - 25 Apr 2014 Post subject: |
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Vincent wrote: | As the twin spar frame doesn't need to surround the engine.....above and below....it means everything can sit lower to the ground and the engine further forward. Obviously, this has an effect on everything else - suspension, wheel size, headstock height, rider position....etc, etc. Probaly why OPs forks are too short.....nein? |
No. The type of frame actually has very little to do with geometry other than the physical constraints placed by frame members in the way. In the case of the GS it is an old bike that was built before the present fashion of making everything compact. It would also probably have had an 18" front wheel. The high headstock is more likely caused by the spine frame design and it was easier to have longer forks rather than drop the headstock.
Vincent wrote: | If you're going to alter the geometry of a bike, personally, I'd prefer to keep some things as they were originaly....project bike or donor bike.....mixing the rear suspension from a twin shock duplex framed bike with the front end from a twin spar monoshock bike, may create problems, with the geometry. 'Only a thought. |
Incorrect for reasons stated above.
Where you will find problems is in completely different suspension set ups ie damping, spring rate etc but this would likely happen regardless of where the parts came from.
Vincent wrote: | If you change the length of the stantions, do you need to do anything to the internals of the forks? |
Spring spacers of the same length.
Simple thing that everyone misses is that of you change suspension parts there is a lot of internal work to do as well.
<edit> A good point actually now I think about it. Dependant on the fork internals it may be required to machine up a new damper rod which is beyond most amateurs. I would have just fitted a set of forks from a 90> GSXR11 or 90-94 750</edit> |
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Vincent |
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Vincent Banned
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sickpup |
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sickpup Old Timer
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Old Thread Alert!
The last post was made 9 years, 360 days ago. Instead of replying here, would creating a new thread be more useful? |
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