Hershey makes four types of hubs, with three hole drillings, and three variations on the rear spindle/freehub. Our computer system is capable of selling these hubs in pairs according to your specifications, so we are going to discuss each of the hubs individually. At the end of this Hershey section we will provide you with pair prices, and options to make pair "kits" from among these four hub types and their options.
This is the first of Greg's front hub designs. The hub using a three piece shell, has both flanges machined from 7075-T6 aluminum rod with the core tube made from Ti 6Al-4V tubing. The flanges are pressed into the Ti tube. Each flange recesses a precision sealed cartridge bearing. The axle is machined from Titanium 6Al-4V rod, has a 9.5mm outer diameter, which reduces at the ends to the needed 9mm O.D. The hollow axle has a 5.2mm inner diameter. Though the axle is carefully pressed into place, the hub uses two locking collars, one on each end to assure the axles position. The outer face of each collar has a 16.5mm diameter that contacts the fork end. The locking collars use a steel set screw with a 50/1000ths hex head fitting to cinch them in place. Greg is considering changing the size to something more common, like 1mm in the future. The front hub has a 39.5mm hub flange diameter, with the hub flanges spaced 75.5mm apart. The front spoke holes have a 32mm center circle diameter. The Ti front weighs 90.5 grams. The flanges are Silver, the core tube is Ti Grey. The hub is available in a 28, 32 or 36 hole drilling. Made in USA.
Standard front only $ Price in Catalog
This is a truly original design that reveals the real simplicity of a front hub. The Naked hub uses a clear polycarbonate plastic tube as the core tube between the flanges. The flanges are machined from 7075-T6 aluminum rod. Like the Ti standard front, the Naked flanges recess each recess a precision sealed cartridge bearing. The flange houses 3/10" of the plastic tube. Three ridges cut around the interior of the flange butting side provide space for the bonding agent that holds the flange and tube together. Although all three pieces of the hub shell are rigidly put together, the outer axle locking collars are what really binds the bearings, axle and hub pieces together. The axle is machined from 7075-T6 aluminum rod. Its outer diameter is 11mm up to the inner side of the bearings where it reduces to the needed 9.48mm through bearing's inner race, and finally drops down to the 9mm needed for the fork end. The step between the 11mm to the 9.48mm makes a shoulder that the bearing rests against. With one of the bearings installed, the axle is placed into the shell, then the second bearing is installed. The locking collars are machined from aluminum, these provide a finished 16.5mm diameter face that presses against the fork end and in pressing from both ends, cinch all the hub parts together. A single steel set screw with 50/1000ths inch hex fitting locks the collars in place. The Naked hub has a 39mm hub flange diameter, with the flanges spaced 62mm apart. Its spoke holes have a 31.5mm center circle diameter. The Naked front weighs just 79 grams. The flanges, axle and locking collars come all anodized the same color, which can be Blue, Black, Lavender, or Silver, the core tube is clear plastic. The hub is available in a 28, 32 or 36 hole drilling. Made in USA.
Naked front only $ Price in Catalog
Greg Hershey has also designed an oversized front hub for use by Mountain riders. The shell is, again, three piece, two aluminum flanges with a core tube joining them. The flanges are machined from 7075-T6 aluminum rod, with a bearing recess 30mm in diameter to house the larger, oversized bearing. The core tube for this hub comes in two versions, one is Titanium 3Al-2.5V alloy tubing, the other is a "metal matrix" which is the coming term for metals whose alloy and compounding processes are intended to remain unknown. These "metal matrix" alloys are chiefly aluminum alloyed with the normal compliment of alloying metals. The revealing aspect comes when you hear the part is "anodized". The flanges are pressed and bonded onto the core tube, which has a 31.6mm outer diameter. The precision sealed cartridge bearing is the Japanese IJK 6903RS. The axle to reduce weight is machined from aluminum rod and made in two parts. The rod stock it's made from is .75" diameter. The interior of both pieces is milled out leaving two hollow pieces. The shorter one is pressed and bonded into the hollow of the second longer axle piece. The axle pieces have their diameter reduced to 17mm as they pass through the bearing out toward the fork tips. With one bearing installed, the axle is put in place then the second bearing is pressed into the shell. At each axle end the bearing is covered by a cap with an O-ring around its perimeter. The cap slides over the outer axle and the O-ring compresses within the outer flange holding it in place. The 17mm aluminum axle end is still too large to fit inside the fork end, a steel insert threads into the axle end reducing the final axle length to the needed 9mm O.D. The Suspension hub has a 53.3mm hub flange diameter, with the hub flanges spaced 74mm apart. Its spoke holes have a 45mm center circle diameter. The Suspension weighs just 139 grams in the Metal Matrix version. The flanges, axle and locking collars are all Silver, the core tube on the Metal Matrix is anodized Blue, on the Ti model it's Ti Grey. The hub is available in a 28, 32 or 36 hole drilling. Made in USA.
Metal Matrix Suspension only $ Price in Catalog
Titanium Suspension only $ Price in Catalog
The last version of the Hershey hubs is a cassette rear freehub model. The rear hub is made like Ti standard front, (because they were conceived and designed at the as a mated pair). The flanges are machined from 7075-T6 aluminum rod. They are pressed onto a Titanium 3Al-2.5V core tube. The hollow axle is machined from Ti 6Al-4V rod with an outer diameter of 9.48mm to fit into the frame drop-outs. This rear hub uses a single sealed bearing on the non-drive side. The Hershey rear hub is Shimano HG compatible because it relies on Shimano for its freehub. The Ti rear uses Shimano's steel mounting bolt to fasten the Shimano freehub body to the drive side flange. Instead of using Shimano's bearing cup to house nine ball bearings, Hershey uses a sealed cartridge bearing, so this hub uses just one bearing on each side to support the load. The Hershey rear is made in three models. One is for Road riders, it uses a 130mm long axle and the Shimano Dura-Ace freehub body to achieve an 8 speed rear Road hub. Another is for mountain riders with seven speed gearing, and uses a 135mm long Ti axle with the Shimano XT 7 speed freehub. The last is for 8 speed Mountain riders, and uses a 135mm long rear axle, with an XTR rear freehub. The 135mm, 8 speed will accept CS-M737, HG-90, or HG70 8 speed cassettes. For 7 speed, the HG-50, HG-60, or HG- 90 in a 7 speed should be used. To space each of the hubs properly, machined aluminum spacers are used. Their proper use centers the hub flanges properly within the gross axle length. Each of the spacers is locked in place on the axle by a steel set screw with a 50/1000ths inch hex fitting. The Ti rear hub has a 44.3mm non-drive hub flange diameter, and a 55.8mm drive hub flange diameter. The flanges are spaced 55mm apart. Its spoke holes have a 37mm non-drive, and 48mm drive side center circle diameter. The Ti rear cassette, with a 135mm axle and the XT 7 speed freehub weighs 269 grams. The flanges, axle and locking collars are all Silver, the core tube is Ti Grey. The hub is available in a 28, 32 or 36 hole drilling.
Ti Freehub Cassette rear only $ Price in Catalog
Any Hershey Standard Ti with any Hershey Ti cassette rear hub $ Price in Catalog Any Hershey Metal Matrix Suspension front with any Hershey Ti cassette rear hub $ Price in Catalog . Any Hershey Titanium Suspension front with any Hershey Ti cassette rear hub $ Price in Catalog Any Hershey Naked front with any Hershey Ti cassette rear hub $ Price in Catalog
