# Singlespeed & Fixed Gear - How much Rake?

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.

View Full Version : How much Rake?

MASHeug
08-19-08, 01:57 AM
I am riding a Dawes SST wich has a 70 degree head tube... unfortunatly i cannot find anywere that lists the sweep on the fork... I would like a bit tighter ride, and have been looking into a set of forks as a fix, instead of rushing into a new frameset.
So, two real questions:
A) Does anone know the fork sweep on the stock dawes SST fork?

B) How much rake seems reasonable with a 70* head tube.

MASHeug
08-19-08, 02:23 AM
bike in question
http://i26.photobucket.com/albums/c106/hxcgti/dawessst.jpg

kmart
08-19-08, 02:54 AM
With a headtube that slack, you cannot attempt to quicken the steering with a low rake fork without sacrificing stability. I would use one of those online fork rake calculators (google search, they all do the same math even if they are made for motorcycles instead of bicycles) to find what rake you need to achieve the desired trail distance for a 70* HT. Start by entering a typical road frame HT angle of 73* and 40mm rake, assuming this is the kind of handling you are trying to achieve. Then calculate the trail distance this gives. Now enter that trail distance and the 70* HT angle into the calculator and solve for the the new rake. I think the number you will get is really low...

EDIT: Oops, I guess you do want more rake (less trail)...I try not to get those confused...Here's a decent calculator for doing the math:
http://www.kreuzotter.de/english/elenk.htm

zacked
08-19-08, 09:52 AM
You want more rake, not less, if you want to make the handling "quicker".

The bikesdirect owner posts here often, I'd suggest changing the title of this thread so he recognizes it or PM'ing him.

mihlbach
08-19-08, 12:55 PM
The Dawes SST has a 72 degree heatube angle...not 70.

72 is not unusual. Cyclocross frames and small sized road frames typically have a similar head tube angle. Typical road bike geometry usually involves a head tube that is steeper by only 1-1.5 degrees. Thats not much.

Decreasing the rake will make your bike look tighter, but it will handle more sluggishly. I have no idea what the rake is on the stock SST fork, but for that frame I would want something around 45 mm, perhaps a little more, but not much more.