Road Bike Dropout Width

This wheel has a nutted axle measuring about 9 5 mm which i suspect is actually 3 8 inch.

Road bike dropout width. Road bikes have used 68mm bottom bracket shells for ages. The spacing of a hub is measured from the outside faces of the cone locknuts where they come into contact with the frame s forkends most cartridge bearing type hubs don t have locknuts so the spacing is measured from the equivalent shoulder surface of the axle ends the spacing dimension is commonly referred to as the o l d over lock nut distance. Disc brakes on drop bar bikes are quite a new phenomenon. Selecting the correct hub width 130mm or 135mm.

Swapping wheels round between bikes at the weekend i was surprised to find that the steel fork on my city bike a pompino has 10 mm wide dropouts. Track bikes 120mm not compatible. The inner body of the freewheel may not be recessed so as to compensate completely for this flange depth and so the total width the of the freewheel may be greater affecting chainline and clearance at the right rear dropout. Any new disc brake road bike is also likely coming with thru axles don t buy a qr dropout disc brake road bike in 2019 because it s already outdated.

Open drop outs almost always use hubs with skewers qr. The cross threaded rear derailleur main bolt. To 135mm rear dropout spacing on road and road like bikes. Typical hub widths of modern quick release frames are as follows.

The width of an open drop out qr of a fork is about 9 5mm. Road bikes 130mm. Almost all bikes with hub widths of 130mm and 135mm work. Using a tape measure measure inside width of frame fork where hub contacts frame fork.

The dropout or hanger that got marred or scratched from travel or the repeated installation and removal of wheels. I show how to expand the rear triangle of a steel bike frame to allow a newer wheel with wider hub spacing ie a 6 7 speed rear wheel on a road bike is typically 126mm wide and a 8 9 10 speed. A freewheel with splined sprockets has a flange behind the innermsot sprocket. Thru axles feature a larger diameter than quick release skewers boosting stiffness typically at little to no weight penalty.

Measure the diameter of your frame fork dropout axle hole. It was only in 2010 that the uci sanctioned disc brakes on cyclo cross bikes with road bikes experimentally following along a few years. If you ride a mtb or road bike with a triple it becomes quite obvious that differences of a few millimeters in q factor are inconsequential. To illustrate why i prefer replaceable here is my n 1 history of hanger and dropout damage.

Mountain bikes 135mm. Why not change the bottom bracket width. The total width given is that of the sprocket cluster. Visually identify if your drop out in open slotted or closed.