roversteve53 Posted April 3, 2008 Share Posted April 3, 2008 Hi to all. I wonder if someone can help me with a small problem ,I have a 1991 ex police R/R that I fitted a VM 2.5 diesel into,I changed the front springs to the correct ones for the diesel version but left the rear with the police spec ones, Now that I no longer need to carry heavy loads I want more comfort , My parts book shows two sets of springs one set green standard the other set pink/purple progressive , My car also has antiroll bars fitted, so which ones ?, If its the pink/purple which way up ? Thanks in advance Roversteve. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted April 3, 2008 Share Posted April 3, 2008 Hi to all.I wonder if someone can help me with a small problem ,I have a 1991 ex police R/R that I fitted a VM 2.5 diesel into,I changed the front springs to the correct ones for the diesel version but left the rear with the police spec ones, Now that I no longer need to carry heavy loads I want more comfort , My parts book shows two sets of springs one set green standard the other set pink/purple progressive , My car also has antiroll bars fitted, so which ones ?, If its the pink/purple which way up ? Thanks in advance Roversteve. Pink Purple go with the tighter coils at the base If you look in the for sale section I have a brand new set of genuine pink purples for sale Nige Quote Link to comment Share on other sites More sharing options...
Escape Posted April 3, 2008 Share Posted April 3, 2008 Pink Purple go with the tighter coils at the baseIf you look in the for sale section I have a brand new set of genuine pink purples for sale Nige Is there any reason for mounting the tighter coils at the base? We have always put them at the top, easier to fit the bottom retaining plates. Quote Link to comment Share on other sites More sharing options...
DrRob Posted April 3, 2008 Share Posted April 3, 2008 Is there any reason for mounting the tighter coils at the base? We have always put them at the top, easier to fit the bottom retaining plates. I'd like to know too...for the same reasons.. Quote Link to comment Share on other sites More sharing options...
bishbosh Posted April 3, 2008 Share Posted April 3, 2008 I can see no logical argument (in terms of how the spring performs) to have to have them one way up or the other. The only difference the bottom coils will experience is the self weight of the spring above it which is obviously of no consequence. I would say mount them which ever way up you like, or one of each if you fancy it! Quote Link to comment Share on other sites More sharing options...
Steve 90 Posted April 3, 2008 Share Posted April 3, 2008 We always put the closer coils of progressive springs to the top in the forks of the MX bike. The theory of it according to Mr Ohlins was, when they were tight together they are effectively just a lump of weight. With them too the top of the fork it would keep the unspring weight down. That said I went between suspension services once (about 15 weeks) with them the wrong way up and had absolutely no clue, Didn't notice any difference! Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 3, 2008 Share Posted April 3, 2008 Tight coils on uprated springs don't allow enough room for the spring plates on the rear, so I tend to put the close ones at the top Quote Link to comment Share on other sites More sharing options...
malpasman Posted April 4, 2008 Share Posted April 4, 2008 Hi Alan Quote Link to comment Share on other sites More sharing options...
SteveRK Posted April 4, 2008 Share Posted April 4, 2008 Good useful post Alan. I have red/white springs on the rear of mine (Heavy duty) but i wouldnt have known that as the ride seemed quite 'normal' not harsh or excessively bouncy. Quote Link to comment Share on other sites More sharing options...
roversteve53 Posted April 8, 2008 Author Share Posted April 8, 2008 Thanks everybody for your information. I took the top off of the forks on my old 1967 triumph motorbike ( fitted with progressive spings some years ago) and the tight coils were at the top so I'll try that way up first. Still not sure if progressive springs were fitted to anti roll bar models but as I have a pair of progressive springs they are what I'll fit! Heres looking forward to a smooth ride. Thanks Quote Link to comment Share on other sites More sharing options...
bishbosh Posted April 8, 2008 Share Posted April 8, 2008 Progressives were fitted to anti roll bar models. Both my Rangies had them. Quote Link to comment Share on other sites More sharing options...
clbarclay Posted April 8, 2008 Share Posted April 8, 2008 Post 1986 RRC were fitted as standard with progressive rear springs (incidently with the closer coils at the top). Not 100% sure on post 1990 models, I've read reports that on some models they went back to constant rate rear springs. A word of caution about the above table, it only lists a single rate for each spring, though some opf them are progressive rate. For example the pink-purple spring is listed as 178.2 lbs/in, but actually starts at about 120 lbs/in and increases up to 178.2 as it compresses. Quote Link to comment Share on other sites More sharing options...
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