Tag Archives: 9-speed

Gear Calculator updated and now also in German

The Sheldon Brown gear calculator is updated and improved: more tire sizes are covered including fatbikes, 29ers, 29+ and monster bikes, and we now have a version in German, as well as French.

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Additions to the Gear Calculator

New crank lengths have been added to the Gear Calculator and Internal Gear Calculator, so they can calculate gain ratios for children’s bicycles with cranks down to 100 mm (less than 4 inches).

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New tire sizes in Gear Calculator

Several tire sizes have been added to the Gear Calculator: Fatbike sizes: 26 inch tires, 26 x 3.8, 4.0, 4.25, 4.7 Wide 29ers: 29 x 2.7 and 3.0 32 inch and 36 inch (common on unicycles).

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SRAM and Sachs Internal-gear hubs

Updates to our main page on Sachs and SRAM hubs , and our page on the G8 and G9 hubs. We have located additional technical information from SRAM, and wehave fixed a number of Web links that went bad.

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Addition to page on SRAM G8 and G9 hubs

John has added some owner comments to the page on SRAM G8 and G9 internal-gear hubs. Opinions are generally very positive.

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SRAM G9 Hub

Our article about the SRAM G8 hub now also covers the new G9 9-speed.

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How the i-Motion 9 hub works

New section on how the SRAM i-Motion 9 hub works in the article about that hub.

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SRAM i-Motion 9 internal-gear hub

New article about the SRAM i-Motion 9 internal-gear hub — the only public source of information on how to rebuild this hub, and with links to installation information and (hard to find!) parts lists from SRAM.

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More troubleshooting advice on Sachs/SRAM internal-gear hubs

There’s more troubleshooting advice now in our article about Sachs/SRAM internal-gear hubs: how to test whether a problem is inside the hub, or only in the shifter and cable — for hubs with 3, 5 or 7 speeds, with pullchain(s) … Continue reading

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Repair of Shimano STI Drop-Bar Brake/Shift Levers

These levers no longer index properly when the grease inside gums up — and the internals are very complicated. John Allen has posted an article describing several approaches to repair of these levers, and with a link to an expert … Continue reading

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