單車狂熱 -- 彈簧磅數計算機

後避震彈簧磅數計算機

騎程總重量： ( 磅 ) 包含騎士、行李、水袋...等等 (1公斤=2.2磅)

後輪負載比例： ( % ) 這代表的是總重量負載於後輪的比例，預設值是以前輪:後輪=40:60的比例，如果要精確的量測的話，可以用體重計放在後輪，用你正常的騎程姿勢觀察後輪負重，計算出體重負載在後輪的百分比。或者依照騎乘風格來設定 55=XC, 65=FR, 70=DH

後輪避震行程：( 英吋 ) 車架的後輪行程，可參考車架原廠規格，如Giant Reign是6吋的後輪行程。

避震器行程： ( 英吋 ) 避震器可壓縮行程，可參考避震器原廠規格，幾個常用的避震器規格為眼對眼165mm (1.5吋)、190mm (2吋)、200mm (2吋/2.25吋)、222mm (2.5吋)

下沉量設定( sag )： ( % ) Fox建議的下沉量設定是25%的行程。這裡考慮的是無預壓的彈簧磅數，依照下沉量百分比設定去計算所需的彈簧磅數。也可以照你的騎乘風格來微調，譬如你喜換跳落差、玩土坡騰躍，那你的下沉量設定要少一點，而相對會得到高一點的彈簧磅數。

彈簧預壓： ( 預壓環旋轉圈數 ) 最小值為 1.0 圈的預壓

彈簧末端效應： ( percent ) 避震器使用的彈簧通常在初段行程會有比較低的彈簧磅數，預設值是作者對此效應的猜測值，設定值是用來計算預壓環圈數對該比例彈簧磅數的影響。

參數輸入
騎乘總重量 ( 磅 )
後輪負載比例 ( % )
後輪避震行程 ( 英吋 )
避震器行程 ( 英吋 )
下沉量設定 ( % )
彈簧預壓 ( n.n )
彈簧末端效應 ( % )

參數輸出
車架槓桿比 ( 車架行程 / 避震器行程 )
計算所得彈簧磅數 (磅/英吋)
彈簧磅數建議值 (磅/英吋)
建議值之相對下沉量 ( % )

鄰近彈簧磅數
彈簧磅數 ( 磅/英吋 )	下沉量百分比 ( % )	下沉量 ( 英吋 )




-> <-	-> <-	-> <-

Preload Precautionary

Preload adjusters apply about 1mm or .039" per turn.

If the spring is not marked as to its real stroke never use more

than 2.0 turns on the preload adjuster too avoid coil binding.

If the spring is marked as in 600# x 1.63" or 600# x 41mm

calculate the available preload by spring stroke minus shock stroke.

Be Careful

Even though you may be well within the limits for avoiding coil binding,

using a lot of preload stresses the shock leading to premature failure.

Correction For Suspension Progression

Anything plus or minus <7% can be ignored.

Rising Rate ( 7% - 15% ) - Subtract 50 lbs.

Extreme Rising Rate - rare ( 15% - 25% ) - Subtract 100 lbs.

Falling Rate ( 7% - 15% ) - Add 50 lbs.

Extreme Falling Rate - common ( 15% - 25% ) - Add 100 lbs.

( or simply ride with the calculated spring rate and let personal preference decide )

踩踏平台後避震器修正

若是使用踩踏平台的後避震器，可減低50磅-100磅的彈簧磅數

( 或者先依照計算出的值試騎看看，再依照個人喜好來決定 )

參考連結

http://www.engineersedge.com/spring_terms.htm

http://www.engineersedge.com/spring_general.htm

http://www.engineersedge.com/spring_comp_calc_k.htm

http://www.engineersedge.com/spring_comp_calc.htm

http://www.rpmnet.com/techart/spring.shtml

Mountain Bike Spring Rate Calculator V4.0

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

To receive a copy of the GNU General Public License write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

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