Chopper Fork Length Calculator

Davie FL 33314-3721. The long forks are an extension of the original racers who would lengthen the forks to obtain more ground clearance.

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So you want to ditch the stock hydraulic front end for a custom springer.

Chopper fork length calculator. You can email with questions. More info following always updating for you. A different size fork tubes is needed to work on some FLT models 2002-2005 use cartridge damper on the left side.

Note that using Dropped rockers to bring trail back into a normal range will change the length of the fork legs needed for a particular bike significantly so you cant install such rockers on an existing set of forks. Length from the center of the steering neck at top of triple clamp perpendicular to the ground. 5490 SW 42nd St.

Hayabusa forks are 285. You may have to register before you can post. The angle in degrees of the steering neck from vertical.

Length from to top of the fork tubes to the centerline of the axle. A chopper is still a chopper whether it has a 750 Honda motor an SS 145 or a small block Chevy. Bikes I liked have been running about 12 to 14 inches.

Click the register link above to proceed. Figuring Out Fork Length For A Custom Long Bike. Fork Length Chart and RakeTrail Calculator If this is your first visit be sure to check out the FAQ by clicking the link above.

Enter 3 of the 4 values below to calculate the 4th. To determine what length of fork tube to use for a stock tubular fork measure the stock fork with weight on it before removing. Not trusting the online trail calculators on the internet I used a CAD program to calculate a large number of setups taking into account downtube stretch neck rake and triple tree rake and crunching the numbers for trail and fork length for every possible combination.

Im going to run a 19inch front wheel and the down tubes are going to be 4. Compare andor match fit of two bikes. For forks over 38 in length you really need to go to 1125x156 tubing at least for the front or primary legs.

Forks 32 to 38 in overall length need to be 1 OD by 156 wall material. Some models are using 2 cartridge dampers 1 in each tube. If you only have the frame measure from center of top of steering neck perpendicular to the ground and add 1 to this measurement.

Im guessing the rake will be in the high 40s. People liked the look and forks got longer. The first thing you need to know how to do is take measurements for your new built to order piece of hardware.

I need to know when setting up a frame how to get the right tube length on the forks. Start with this calculator rb racing fork length and trail calculator then mockup frame wheel and ideally if you already have the tree. Calculate frame geometry of an existing bike through simple XY measurements.

Aftermarket forks are in the 30 32 34 or longer range. The diameter of the front tire. In order to do this I operated under the following assumptions.

Place blocks of wood under the frame so it levels at desired clearance actualy i would set the front a bit lets say 5 higher- that will be negated by appropriately tuned suspension when the bike compresses with it own wt the fork. Forks 31 to 32 in overall length need to be 1 OD. OEM Harley forks are in the 31 to 32 range.

Test size and fit of a frame before buying. For example if your stock fork is 20 inches from the bottom cup the center of the axle and if after playing around with tire sizes height and so forth you determine that you need 29 inches between the cup and the. Centerline of the top steering neck to the centerline of the top of the fork tubes.

Originally Published In The March 2015 Issue Of Cycle Source Magazine. Once I set the frame level with the rear tire mounted how do I go about getting the right measurement for the extended front wide-glide tubes. OEM Harley forks are in the 31 to 32 range.

Its the long forks that make it the bike a chopper. Fork Rake offset mm. Aftermarket forks are in the 30 32 34 or longer range.

Calculate a full chart from the often sparse geometry chart provided by the manufacturer. I have a rigid 45 degree rake 4 up 3 out frame and plan on running a 21 front wheel. I want to have all the details worked out before I start getting dirty.

Im planning a pseudo-long bike build. The distance between the top of the fork tubes to the centerline of the axle. 27 inch nominal 26 inch nominal 700 X 40 44-622 700 X 38 38-622 700 X 35 35-622 700 X 32 32-622 700 X 28 28-622 700 X 25 25-622 700 X 23 23-622 700 X 20 20-622 27 X 1 38 35-630 27 X 1 14 32-630.

For standard triple trees enter 0 degrees. Twisted Choppers Shows Us How. Inches Length from to top of the fork tubes to the centerline of the axle.

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