J
Jasper Janssen
Guest
On 2 Jun 2003 15:06:20 -0700, [email protected] (Bluto) wrote:
>I broke two spindles under pedaling loads only, with the fracture emanating from the root end of
>the taper flats. Both the spindles in question were drilled for 8mm crank bolts, and the
>cross-sectional area at the break was disturbingly small.
I wonder if it helps to have the old fashioned wider 14 or 15 mm bolts, instead of the
allen key ones.
[BMX cranks]
>Double or triple spiders can be obtained which use this method of attachment:
>http://shop.airbomb.com/site/intro.cfm?PageID=37&SKU=CR7013
Getting a triple with those would necessitate having crank, spider adapter, chainring, triplizer
chainring, granny chainring, I think, unless you can find a granny in 110, which makes you limited
in selection of them. But, okay, it's an option. Though it is an expensive option (because of the
expensive adapters), and with all those adapters in there, I'm not so sure it's still a strong one
-- particularly for the granny gear. You're then going through a lot of fasteners to transmit the
force into the crank.
>> I don't think it's a good idea to tell the guy he needs to spend a thousand bucks before he can
>> even think about riding. Besides, he mentions he wants to ride Sunday afternoons with his kid..
>> that's not gonna be terribly arduous riding in any case.
>
>True. But neither will it effect the weight loss the OP stated was his goal. I think the guy can
>get set up for less than $300 if he starts with an appropriate secondhand bike.
Hmm, I completely missed the weight loss thing, it was so off the cuff. You're right there.
Jasper
>I broke two spindles under pedaling loads only, with the fracture emanating from the root end of
>the taper flats. Both the spindles in question were drilled for 8mm crank bolts, and the
>cross-sectional area at the break was disturbingly small.
I wonder if it helps to have the old fashioned wider 14 or 15 mm bolts, instead of the
allen key ones.
[BMX cranks]
>Double or triple spiders can be obtained which use this method of attachment:
>http://shop.airbomb.com/site/intro.cfm?PageID=37&SKU=CR7013
Getting a triple with those would necessitate having crank, spider adapter, chainring, triplizer
chainring, granny chainring, I think, unless you can find a granny in 110, which makes you limited
in selection of them. But, okay, it's an option. Though it is an expensive option (because of the
expensive adapters), and with all those adapters in there, I'm not so sure it's still a strong one
-- particularly for the granny gear. You're then going through a lot of fasteners to transmit the
force into the crank.
>> I don't think it's a good idea to tell the guy he needs to spend a thousand bucks before he can
>> even think about riding. Besides, he mentions he wants to ride Sunday afternoons with his kid..
>> that's not gonna be terribly arduous riding in any case.
>
>True. But neither will it effect the weight loss the OP stated was his goal. I think the guy can
>get set up for less than $300 if he starts with an appropriate secondhand bike.
Hmm, I completely missed the weight loss thing, it was so off the cuff. You're right there.
Jasper