Dave wrote on 08/13/14 at 09:45:02:rapfohl wrote on 08/13/14 at 09:29:13:Just two quick questions for a Ryca build vet. Sorry if they have been beaten to death.
1. The swingarm mod. From what I understand it is for tires that have an OD of greater than 26". Did you have to do it for your tires? They look like the same Kenda K671's that I like and normally ran on my old street bike. Ryca shows the K671's OD as 25.25"
2. When you go to mount the seat, does it only attach in the front, and then just rests on the cut seat tubes? Or does it somehow attach to those cut tubes? The CS2 seat looks like it just rests on there too.
The stock swingarm works with any "modern" tire that fits the 18x2.50 rim that is most often used. The problem with the vintage tires is the square tread profile and large diameter contacts the stock swing arm. If you are going to ride the bike in any kind of a "hustle"...use a modern tire. Unfortunately I believe the current fad is to put too wide a tire on the narrow rim. A 110/80-18 tire should be on the 18x2.50 rear rim, and a 90/90-18 front tire should be on the front 18x2.15 rim. This is plenty of tire for the weight and horsepower of the bike. If you want to run a 130/70 rear tire - then mount a 18x3.50 rear rim....which is what the tire is made for. The front 18x2.15 (19x2.15) rim can run a 100/90 tire OK.
Here is a fitment chart for the Bridgestone Batlax BT-45, and the chart matches what most other tire folks publish.
http://www.bridgestone.com/products/motorcycle_tires/products/battlax/bt45.htmlWhen you put the "too wide" tire on the narrow rim - it rolls the tread over onto the sidewall and makes the tread profile too round. You therefore cancel out the efforts the tire manufacturer has taken to make the tire have a small footprint when vertical, and a large footprint while banked over.
The rear of the RYCA seat pan attaches to the same rear bolt holes that the stock seat did - but it does also rest on the cut off frame tubes if you cut them accurately.....there a gap if you trim off too much and the bolt holes will do the work. The front of the seat pan attaches with the same two bolts that mount the fuel tank.
Dave
Hi Rapfohl,
Have you seen the Ryca build videos on YouTube?
There are quit a few and are very helpful.
You can access them from Ryca's web page...
http://www.rycamotors.com/resources/index.htmlThis one covers the seat attachment towards the end of the video...
As far as being too clean, this bike only has 64 miles on it, give me some time to grody it up