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These dimensions are the overall shock length, not the length between the pivot centres. Yoke rear - 107mm extended, 79mm compressed Yoke front - 87mm and 68mm Asso rear (1.32) - 111mm and 78mm Asso front (1.02) - 96mm and 70mm Asso fron (0.89/0.71 shaft) - 83mm and 66mm This suggests to me that you need the 1.32 bodies and shafts for the rear, and the 1.02 bodies, with the 0.71 (slightly shorter) shafts up front (I estimate this will give an extended shock of 88mm). Or you could make do with the 1.02 shafts and a healthy dose of internal spacers (approx 9mm). So that's the shock lengths (roughly) sorted. Here are the spring lengths... Yoke rear - 64mm Yoke Front - 45mm Asso rear (1.32) - 69mm Asso front (1.02) - 57mm Asso buggy front - 35mm (42mm for blue) Bear in mind that the Yoke shock collars are approximately 5mm higher up the shock than the Associated collars. Now for a look at HPI's spring range... Rally springs - 40mm MT Front springs - 57mm MT rear springs - 70mm These HPI Springs are a neat fit on the shocks (the associated springs are wound a bit "tighter" than the Yokomo springs, and need a little coaxing to fit onto the Yoke shock collars - if the spring unpopped itself from the Yoke collar mid-race, it would mess up the ride height and therefore the handling). The 70mm springs are probably a touch too long for the rear of the Yoke - so to get a realistic ride height, you would need to use the 40mm springs up front and the 57mm springs in the rear, with quite a lot of spacing. However a soft 70mm spring may "settle" enough under the cars weight to give an OK ride height. Here are the magic numbers for converting between metric spring rates and imperial... With a metric (g/mm) rate, multiply by 25.4, then divide by 454 to get the imperial (lb/in) rate. With an imperial rate, multiply by 454, then divide by 25.4 to get the metric rate. The HPI range seems to cover roughly similar rates to the Associated springs, with some slightly stiffer options as well. They may be a slightly better option if you want to retain the Yokomo plastic shocks, but they are expensive compared to the Asso springs. Web links for spring rates... HPI - [url]www.hpiracing.com/op-spri.htm[/url] Associated - [url]www.teamassociated.com/newprod/1580_springs.htm[/url] Losi Buggy Springs (Rates are in lbs/in) (note how they cover a wider range of rates, particularly at the rear) ([url]www.teamlosi.com/partlist/index.htm[/url]). The Losi have a wider internal diameter than the associated springs, so fit the shock collars more comfortably. A-5128 2" Spring 2.5 Rate (Red) A-5129 2" Spring 2.9 Rate (Orange) A-5130 2" Spring 3.2 Rate (Silver) A-5132 2" Spring 3.5 Rate (Green) A-5134 2" Spring 3.8 Rate (Blue) A-5146 2.75" Spring 1.6 Rate (Grey) A-5147 2.75" Spring 1.8 Rate (White) A-5148 2.75" Spring 2.0 Rate (Yellow) A-5150 2.5" Spring 2.3 Rate (Pink) A-5152 2.5" Spring 2.6 Rate (Red) A-5154 2.5" Spring 2.9 Rate (Orange) A-5156 2.5" Spring 3.4 Rate (Silver) A-5158 2.5" Spring 3.7 Rate (Green) A-5160 2.5" Spring 4.1 Rate (Blue) ёWXY:;<ЁЂЃ~€'()efguvPQ *+Йњѕ№ыцсмзвЭШУОЙДЏЊЅ ›–‘Œ‡‚}xsnid_Z ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c ]a c!мЅe#Р ё#32,2l,2l22 2 ЊG(2ь2˜2Tю2GTimes New Roman Symbol ArialTimes New RomanUPDATE 13/04/04 How time passes quickly... A lot of the info below is getting long in the tooth now. Biggest change has been the release of the "Special" BC kit, with it's White springs. These are close to the Gold MX-4 springs in rate, hard to say how they compare exactly, as there are no stated rates (thankyou Yokomo...). My recommendation now would be to run the Yokomo Low-Friction shocks, if you happen to own a Special. If you want to swap to the Associated shocks, go for the basic B2/B3 shock kits - 0.89 bodies/.71 shafts front, and 1.32 bodies/1.02 shafts rear. Use the Yokomo shock ends and shock collars, and use the Yokomo springs. If you want to run Associated springs, either force them onto the wide Yokomo collars, or run Associated bottoms and the longer 1.02 front bodies and 1.32 rear shafts. ------------------------------------------------------------ ADDED 10/12/02 OK, so I got a bit tired of trying to tune my BC with Yokomo's "mystery" springs - all I could work out was that the kit silver springs were a bit stiffer than the MX-4's gold springs, which I managed to get a set of. Obvious solution - use Associated springs - after all, Yokomo and Associated have close links, the shocks look similar, and lots of people have fitted associated shocks in the past. But... (here's the science bit) The Associated springs have a smaller inside diameter than the Yokomo springs. So they fit over the body, but they don't fit on the collars. Next thought - use the associated shock collars. That doesn't work either, because the lower collar won't fit over the wide Yokomo shock end. So fit Associated shock ends as well. That will get the Associated springs on - but it will also make the shock around 3mm shorter, which may not help on a bumpy track (front downwards travel in particular could become limited) (note that Yokomo's shock shafts are 3mm diameter, and Associated's are 1/8") OK, lets take a different tack, and modify the standard Yokomo lower collar to fit the Associated springs. But if we do that, the springs lengths come into play, because the Yokomno collars actually sit further up the shock.Although the buggy fronts will work ok, you won't be able to run a low ride height at the rear (something I like to do for indoor running), so the slightly stiffer truck front springs would have to be used. How about using a larger diameter spring, like the Losi ones? The Losi springs will fit on the Yokomo collars (quite loosely in fact) - but their shortest Buggy spring is 2", which again will rule out low ride-heights at the front end. Onto the Associated shocks themselves. The B2 shock sets (front .89 body/.71 shaft, rear 1.32 body/1.02 shaft) have the same sized body as the Yokomo kit shocks, and similar length shafts, but because of the shorter shock ends, they end up about 4mm shorter all round than the kit shocks. This could cause problems with rough track handling (note: these are the shocks I have fitted). To get a similar overall length, you would have to use the 1.02 body up front, with either the .71 shaft, of the 1.02 shaft with lots of spacing on it. At the rear, you'd need the 1.32 body and shaft, again with quite a lot of internal spacing. One problem with the 1.02 body up front is that when compressed, the shock is about 2mm longer than standard - this means that the car can only just bottom out at the front if you're using the inner wishbone mounting hole. If only associated did a .89 shaft. The rear shocks also need about 5mm spacing on the outside, to stop the wheel going too high and straining the driveshaft in the outdrive. SUMMARY: Use the 1.02 and 1.32 shock kits on the BC, with a healthy portion of spacers (#6466 is associated's spacer set), then use the buggy front and rear springs. 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