I have been comparing the geometry of two cyclocross bikes: a size 53 Niner RLT 9 and a size 51 Cannondale CAADX and I can’t figure out why the stack height of the Niner (stack of 574) is significantly higher than the CAADX (stack of 541). Both have head tubes of 145, and HT angles of 71. The fork length for the Niner is 400 A2C while the CAADX is 410 A2C. Is it the result of the difference in the BB drop, the Niner is 70 whereas the CAADX is 67? Could it be the difference in seat tube length (the Niner is 530 while the CAADX is only 500)? Any thoughts. Thanks.
All the Niner forks I’ve seen specs for have a 470mm A-C. The 3mm difference in BB drop ain’t it.
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Simply put, the niner isn’t a “cyclocross bike” its a “gravel grinder” where the Cannondale is a traditional cx bike.
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I had the same thought but they are MTB forks so I contacted Niner and they said the A2C for the RLT fork is 400, which is in keeping with a cross bike.
Your point actually gets to the essence of my question really. The Niner is supposed to be something different, but all the numbers seem to match the CAADX except for the stack value. Maybe they are essentially the same but Niner and Cannondale measure stack height differently.