huski Posted November 21, 2019 Report Share Posted November 21, 2019 Does anyone know what,if any benefit a little rear suspension sag gives please?My TRRs has none with the standard spring compressed 8mm 1 Quote Link to comment Share on other sites More sharing options...
TRS Fan Posted November 21, 2019 Report Share Posted November 21, 2019 If you look at the TRS UK website there is a questions and answers section that have replies from Steve Saunders. If you scroll down the list of comments you will find a post from Steve recommending 15mm of sag under the bikes own weight. Phone or email Steve Saunders if you want more clarification. Quote Link to comment Share on other sites More sharing options...
b40rt Posted November 21, 2019 Report Share Posted November 21, 2019 Without sag the suspension cannot react as effectively, i.e. it allows the wheels to drop into dips and follow the terrain more precisely, improving grip. Particularly in very slippery conditions. 2 Quote Link to comment Share on other sites More sharing options...
section swept Posted November 21, 2019 Report Share Posted November 21, 2019 If you understand ‘sprung’ and ‘unsprung’ weight then setting up the sag is one part of getting the suspension adjusted to suit your bodyweight. There is the weight of the bike plus your weight to carry about on two wheels. Hence some of the top riders have invested time and money to arrive at the best compromise to allow the front and rear wheels to follow the ground without boing the bike all over the place. You can adjust the front forks with different strength springs and spacers to make the springs react. Rear suspension can be set again with different length shocks, less or more powerful springs. Then there comes the damping which controls rebound and with further mods to sone extent compression. So if you get on your bike and the weight of yourself compresses the suspension too much then your ride is going to be seriously compromised. Bike sag = the suspension supports the bikes sprung weight normally about 10-15mm ( bike lifted up so weight is off suspension then allowed to settle perfectly upright...measured at a fixed point) Bike sag with rider (in riding kit +helmet and gloves) Rider gets on bike with bike in upright position total sag now measured. Should be approx static sag + second sag approx 25-30mm Applies to both ends ? All pivots and levels accepted as in good order. NB Some riders have carried out suspension set up with the tyres removed from the rims to get exact movement...extreme but valid. 4 Quote Link to comment Share on other sites More sharing options...
huski Posted November 21, 2019 Author Report Share Posted November 21, 2019 Thanks guys Quote Link to comment Share on other sites More sharing options...
anotherfive Posted November 24, 2019 Report Share Posted November 24, 2019 I suppose the final comment by Section Swept could almost be done by pumping the tyres up rock hard to do test? 1 Quote Link to comment Share on other sites More sharing options...
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