Shaft-Drive Bicycle

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Published on March 13, 2014

Author: dynamicbicycles

Source: authorstream.com

PowerPoint Presentation: Review: D y namic “Crossroad 7 ″ S haf t -D r iv e B i c y c l e July 26th , 200 7 b y Jac k " G hos t Rider " Sweeney D Y N A M I C B I C Y C L E S - C R O SS R O A D 7 Bi ke R eview: D yn a m i c Cr o s s r o a d 7 P a ge 1 © www. Bi keC o m m u ter s.c o m T h e go o d f o l ks a t D y nami c Bic y cle s o ffered thei r “Crossroa d 7 ″ c o m mu t e r bike t o u s f or testing . I n ma n y respec t s , it i s like s o many ot he r c o mmu t e r- o rien t e d bi c y cle s on t h e mar k e t — T IG-wel d e d a l uminu m frame, mountin g p o ints fo r f e nd e r s an d r e a r ra c k, u prig h t ri d i n g p ositio n . W h e r e t h is bike differs , howe v e r , i s ho w powe r ge ts from th e p e dals t o th e r e ar h u b. This bike us e s a v e ry c l e v e r and d ece pt i ve ly simple s h a f t d r iv e . Y e ah, that’ s righ t — no gr e as y c h ain, n o chainring s to che w u p yo u r pan t s . I n fac t, D y nam ic t a k e s t h i n gs a s t e p fu rt h e r by m o un ti n g t h e s haf t - dr i ve to a Sh i man o Ne x u s In t e r - 7 i n t e r na l hu b. S o, n o derailleur s either! S p e c i f i c a t i o n s : Aluminu m Frame Aluminu m fron t fork D y nami c S t ree t Shaf t Dri ve Shiman o Ne x u s Inter- 7 Gearing , All- internal Shiman o Ne x u s 7-spee d Twis t Grip Shift Ale x DA - 1 6 Hig h Profil e Alloy Rims (28-38m m tires) Kend a Ti res , 700C×35 , 5 0-85psi T e ktro Q uar tz a ll o y br a ke s ; fr o n t disc brak e o p tional T e ktro 2 - f i n g e r Al l oy br a ke l e v e rs Bas e price : $699.00 PowerPoint Presentation: Review: D y namic “Crossroad 7 ″ S haf t -D r iv e B i c y c l e July 26th , 200 7 b y Jac k " G hos t Rider " Sweeney U n i q u e , S t y li s h F r a m e T h e fram e f or t hi s bike i s uni q ue : a narrower-widt h bot t o m b racke t (BB ) shell tha t is al s o larger in di a mete r fro m a t radi t iona l B B an d ele v a t e d chains t a ys t hat ar e wel d e d to t h e b as e o f t h e sea t t u be r a t h e r t ha n to t h e b a c k o f t h e BB s h e ll. T h e ele v a t e d chains t a ys g i ve r oom to m o un t t h e shaf t - dri ve assembl y. T h e rear-facin g “ t rack s tyl e ” f o r k end s p o si tion th e rea r whee l in t h e fram e an d alig n t h e r e a r hub’ s spiral b e v e l g e a r w ith t h e r e st of t h e s haf t - drive a ss e m bly. O bvio u s l y, r e t r o f itti n g t h is s haf t- driv e assembl y t o a trad i t iona l bicycl e frame is o u t of t h e q u e s t i o n . Bottom br a c k e t c l e a r an c e to t h e gro un d wit h 700×35 C tire s i s a whoppin g 1 0 inches! An d t hi s i s p ur e clearance , too – t her e i s no chainrin g t o catc h o n o b s t acle s i f a rider shoul d happe n to fin d him - o r herself hopping ov e r a s t ee p c urb. D id I m e ntion th e paint j ob on thi s b i k e ? I n lo w light , i t appear s t o b e a dul l charcoal grey. I n sunlig h t, howe v e r , it shine s with pi n k an d bl u e iri d escence…e v er y bit as flash y an d sex y a s a Ja p anes e k e iri n bi k e ! Here’ s a pic t ur e o f t h e h e ad t ub e an d t h e glossy paintj o b …th e ph o t o do e s n ’ t do this colo r justice! S - M - O - O - T - H R i d e Ov e r th e past month, I h a ve ridde n thi s bike ov e r 10 0 mile s t o an d f ro m wor k an d o n a numbe r o f recreationa l rides . Whil e I don’t ha ve an y wa y to quan ti f y (wi th cold , hard number s – t hi s ain’ t a p h y sic s lab ) ju s t how muc h mor e efficien t a shaf t - dri ve i s as compare d to a t rad i t iona l chain-dri v en bi c y cle , I ca n sa y wi th c o nfi d enc e t ha t t his shaft-driv e feel s s-m-o-o-t-h . I n fact , i t i s so smoot h th a t i t feel s odd l y boneless ; chain- driv e n bik e s give th e rid e r a lot of f ee dba c k in t e r m s of fr i c tion a s t h e c ha in wra ps aroun d cogs , chainring s an d derailleur pull eys . Wh e n I r ode th e D ynami c , th e only sensa t io n wa s t ha t I cou l d v e r y fain t l y feel t h e be v e l gear s meshin g agains t eac h o t her. I t i s D E FINITE L Y different-feelin g tha n a c h ain - driv e n bik e ! Bi ke R eview: D yn a m i c Cr o s s r o a d 7 P a ge 2 © www. Bi keC o m m u ter s.c o m PowerPoint Presentation: Review: D y namic “Crossroad 7 ″ S haf t -D r iv e B i c y c l e July 26th , 200 7 b y Jac k " G hos t Rider " Sweeney Anoth e r p e r ce i v e d b e n e fi t o f thi s shaft- drive i s ther e i s n o “gea r lash ” o r la g when p e daling – p e daling for c e is instant l y and seamlessl y converte d t o forwar d motion . On a chain-dri v e bi k e , t her e i s alwa ys a bi t of la g a s chai n slac k i s t a k e n u p b y t h e derailleu r spring s an d a s th e freewheel/ c a ss e tte p aw ls e n g a g e . N ot so w i th t h e Crossroad 7 – yo u p e dal and G O ! !! T h e rea r spira l be v e l ge a r o f t h e shaf t - dri ve syst e m a t t a c h e d to t h e Ne x u s hu b: Standin g o n th e pedal s t o grunt u p hills was whe n t hi s s y s t e m fel t weirdes t – an d when th e nearl y frictionles s dr i v etrai n wa s most n oti cea b l e (an d a pp reci a t e d ! ) . T h e s y s t em is silen t – th e onl y n oise it make s i s some occasiona l fain t ti c k in g i n cer t ai n gears , and t ha t c a n be a t trib u t e d to t h e Ne x u s hu b, n ot th e shaft-drive . Thi s b i k e is S T EA L TH al l the wa y! Shif ti n g i s a b ree ze – t h e Ne x u s hu b is spectacular . I foun d my s e l f shiftin g more ofte n becaus e i t wa s s o eas y an d smo o th, an d I foun d t h e rang e o f se v e n speed s to b e mor e tha n adequat e fo r m y relat i vel y flat commute . Fo r peopl e li v i n g in mor e hil l y areas , a n 8-spee d Cross r oa d mode l is a v ailabl e fro m D y namic. H ow muc h do e s t h e shaf t - d ri ve s y s t e m a dd i n weigh t t o a bi c y cle ? Th e manufac t urer c l a i m s t ha t t h e s yst e m a dds l e ss t ha n o n e poun d a s co m p are d to a geare d bic y cle , and t h is ma k e s s e ns e …af t e r a ll, t h e e n tire assembl y consist s o f fou r chromol y s piral be v e l gears , a shaf t an d aluminu m housing. I t h i n k m o s t p e o ple c a n l ive w ith a n e x tra pound…an d fo r t h e rea l weigh t -weenie s out there , a fe w judiciou s p a rt s swap s cou l d help lose som e of tha t w e ight. E a s y M a i n t e n a n c e Main t e nanc e is , fo r t h e mos t pa r t, a non- iss u e w ith t h is bik e . I ro d e t h is b i ke in t w o hea vy Florid a summe r d o wnpour s wi th deep puddle s almo s t u p to t h e hubs , an d I ne v e r ha d to w o rr y a b ou t a ru s ty chain . D y namic recommend s addin g a sho t o f greas e t o the driv e ever y 600-1,00 0 m i les . T h e shaft-drive c o me s c o m p le te wi th a zer k - type g rease gu n fi tti ng…ju s t a t t ac h y o u r greas e gu n and s q uir t a bit i n t here . T h e manufac t urer recommend s Finis h Li ne’ s T e flo n grease . I couldn’ t fin d m y greas e gun , s o I use d a 1 2 c c syri n ge w ith a pl as t i c “g as tric t u be l a v a g e ” t i p to i n j ec t 4 - 6 c c of gr e a se i n to t h e s haf t - drive af t e r r e m ovi n g t h e z e rk f itti n g . T h e Ne x u s hu b nee ds o ccasi o na l ca ble adjus t ing , whic h t a k e s al l o f t w o minu t es, an d th e brak e s c o u l d us e som e o cc asional t wea ki n g. I s i t e v e r t ha t sim p l e on a g e arie? N o gr e as e gun? N o pr o b l e m, e s p ec ially if yo u kno w a m e di c a l pro f e ssiona l with acces s t o syringe s : Bi ke R eview: D yn a m i c Cr o s s r o a d 7 P a ge 3 © www. Bi keC o m m u ter s.c o m PowerPoint Presentation: Review: D y namic “Crossroad 7 ″ S haf t -D r iv e B i c y c l e July 26th , 200 7 b y Jac k " G hos t Rider " Sweeney S t ra i g h t F o r w a r d T i r e C h a n g e s Ar e t her e a dditio na l s t ep s whe n chan gi n g a f l a t r e a r tir e ? Y e s, b u t t h e pro ce ss o n ly take s a n e x tr a 3 0 secon d s fro m a tr a d itional bo l t e d - on or Q R wheel . Wi th a screw d ri v e r, r e m ove t h e t w o s c r e w s t ha t h old t h e bl a c k pl as tic rea r hu b c ov e r o n . Sli de t h e c ov e r o ff. Pul l th e shifte r cabl e sh a rpl y d o wnward s t o releas e i t fr om t h e hu b ’ s ca ble g ui de and d e t a c h t h e lea d e d en d f r om t h e h o o k on t h e hu b. Un s c r e w t h e a x le n u ts w ith a 15mm wrench , t a ki n g car e to kee p t h e uni q u e washer s on eac h si de of t h e hu b i n p r op er order . Chang e t h e fla t an d re v e rs e t h e disassembl y process . Thos e specia l washers r e a lign t h e hu b w ith t h e t a il e n d of t h e shaft - driv e , s o no fiddli n g is r e quir e d t o g e t t hing s runnin g sm o ot hl y again . Hell , i t t a k e s lo n g e r to wr i te it o u t t h a n to a c t ua lly do it! R i d e W i t h C o n f i d e n c e T h e fram e feel s s t iff . To be fair , t hi s i s t h e firs t aluminum-frame d bik e I’v e ridde n more tha n a coupl e mile s – I d o n’ t kno w if aluminu m bi k e s alwa ys t ransmi t t his amoun t o f shock . Th e D y nami c frame a pp e ar s u tt e rl y fle x -free , an d wi th t h e b eef y, ovalize d down t u b e , al u m inum fork s and 36-s pok e d d ee p p r o fil e r i ms , t h e ri de fel t a little ha rs h . O v e r t w o m i l e s of m y ro u n d - trip c o mmu te i s ov e r c o bbl e s to nes , whic h can b e prett y punishin g ! Perhap s a carbo n fork an d a suspensio n sea t p o s t woul d have im p r ov e d t h e “ sea t feel ” of t hi s b i ke and t a k e n so m e of t h e e dge o ff ? C u s t o m i z e T h e C o c k p i t Th e part s s p ecification s fo r thi s bik e have high and low point s . T e k t r o Quartz lin e a r pull brak e s ar e a b ou t th e b e s t “ o ff - brand” V bra k e s mone y ca n b u y; eas y to adjus t and tr e m e n dous st o pping p o w e r . Th e Ne xu s hub is superlativ e – smoot h a n d eas y t o shift an d vi r t uall y main t e nance-free . T h e fr o nt hub is a s e ale d b e arin g mod e l mad e b y Access . I a m unfamilia r wit h th e bran d , but t h e hu b i s b eef y an d s m oot h , an d c o mes dis c- r e a dy (Dynami c off e r s a front-disc brak e upgrad e fo r a n a d ditiona l $60). T h e Ale x DA-1 6 rim s ar e to ug h – real pothol e k illers ! Th e hand l e bar s an d stem ar e w o r k manli k e…n ot hi n g fanc y. T h e s a ddle i s suc h a p e rs o na l ch oi c e t ha t I wh ol l y e x p e c t e d t hi s “V el o Pl us h ” sa ddle to be n ot s o plush , a n d I wa s r i gh t ! Th e sea t wa s a bit stif f f or m y p referen c e . ( since t his re v i ew wa s wri tt e n , D y nami c h a s change d t h e seat o n t his m o de l t o a mor e comfor t able padd e d s e at ) . A l s o, t h e pe d a ls t ha t c o m e wit h th e b i k e ar e d e sign e d wit h a narrow profile tha t w e r e sl i pp e r y . E v e n wit h lu g g e d runnin g shoes , m y fee t s l ippe d of f t h e pedal s a coupl e time s i n th e dampnes s that i s summertim e Florid a . ( sinc e thi s review wa s wri tt e n , D y nami c h a s change d t h e p e dals on this mo d e l to a rubbe r -c o at ed non- sli p p e dal tha t giv e s v e ry good trac tio n ). D y nami c offer s a v arie ty o f sea ts an d pedals an d man y o f the ir oth e r bik e mod e ls c o me standar d wit h suspensi o n padde d seat s and rubbe r c oat e d p e dals. I wa s told s u bstit u t i o n s of t h e s e c o m po n e n ts c a n be ma de a t n o c o s t, s o fee l fre e to as k f or somethin g tha t migh t be mor e you r s t yle . T h e “t rac k -s ty le ” rea r d r opo u t s : Bi ke R eview: D yn a m i c Cr o s s r o a d 7 P a ge 4 © www. Bi keC o m m u ter s.c o m PowerPoint Presentation: Review: D y namic “Crossroad 7 ″ S haf t -D r iv e B i c y c l e July 26th , 200 7 b y Jac k " G hos t Rider " Sweeney D o e s t h e shaf t - d ri ve we a r o u t? Well, y e s… e v e ntually . Patri c k P e rugini , the pr e s id e n t of D y nam i c , i n di c a t e d t ha t t h e shaft- drive is d e s i gn e d f o r abou t 10,000 mile s ( d e p en di n g on fre q uenc y of g reasin g) b e for e it r e quir e s r e pla ce m e nt . And, a replacemen t assembl y w i t h al l bearing s is onl y $89.0 0 , avail a bl e di r e ctl y fro m Dynamic. Now , compar e t ha t to a t radi t iona l geared bi ke – ca n y ou ge t 10,0 0 0 mile s ou t o f one s e t o f c hainrings , c ass e tt e c ogs an d a c hain? I didn’ t thi n k s o ! Can yo u r e pla c e tw o (or thre e ) c hainrings , 8/9 / 1 0 c o g s an d a c hain fo r les s tha n $89.0 0 ? On l y i f yo u really, reall y sho p aroun d ! Bi ke R eview: D yn a m i c Cr o s s r o a d 7 P a ge 5 © www. Bi keC o m m u ter s.c o m O n l y M i n o r G r i p e s Tw o gr i p e s stan d ou t in my min d : th e first is th e ridin g posit i on, w h i c h is pr e tt y u p right. W h ile t h is p osition giv e s t h e rid e r a c o mman d in g vi e w of t h e s t ree t s , t her e i s no plac e to hid e onc e s t if f h e adwind s come into pla y . W i t h thi s configuration , the Crossroad 7 i s r e all y n o t d e signe d fo r lo n g- distanc e fas t commutin g . You r o p tion s here woul d b e t o instal l a lo w e r ris e ste m or ch oo s e D y namic’ s r o a d bi ke m od e l w i th dro p handl e bar s an d a m o r e a e rodynamic r idi n g p o s itio n . Th e othe r gr i pe i s tha t w hil e Dynamic ine xp e nsi v el y o ffer s accessorie s suc h a s a rea r rac k an d fenders , a t t hi s pric e poin t I w o ul d li ke to se e both of t h o s e inclu d e d as s t an d ar d fea t ure s (ne v e r hur ts to as k ) . Mo s t similarly- e quipp e d bik e s fro m oth e r manufac t urer s (an d her e I mea n geared commute r bikes ) com e s t andar d wit h rack an d full- c o v e rag e f e nd e rs. O v e r a ll , I t h i n k D y na m i c h a s a w i n ne r w i t h t h e i r C r o ss r o a d 7 . I t appear s (and ri d e s ) i n e v er y wa y li ke th e ar o un d - to w n e rrand , c ommuting an d r ec r e atio n bike it wa s m e an t to b e , an d y o u j u st c an’ t b e a t its low-maint e nanc e fea t ur e s . N o mor e greasy c ha in t a ttoos, t a t t e r e d p an ts c uff s or dir t y hands fro m a mid -rid e ti r e c hange ! H i t s : lo w maintenance smooth , effortles s drivet r a in and shiftin g sy s t em se x y pai n tjob life t im e fram e warran ty p e rfec tly sui t e d f or ar o un d - to wn cruisin g an d medium-dis t anc e (5 - 1 2 miles ) commu t i ng Dynamic’ s sterlin g cust o me r servic e – qu e stion s pr o m pt l y ans w e r e d gr e a t w e bsit e do c um e ntation for main t e nanc e an d ser v ic e of t hese bik e s M i ss e s : Fram e an d rid e ma y b e s tiff fo r some bumpie r commu t e s Saddl e an d p e dals may n ee d c hanging ( bo t h c o mp o n en ts ha v e been u pg r a d ed since t his re v i e w was w r itt e n ) U p righ t s t an c e is c o mfor t a bl e , but give s som e aero d y nami c issue s in headwinds Visit D y nam i c ’ s w e bsit e , www .dy nam i c bi c y c l e s. c om t o l e ar n m ore a bo u t t h e s haf t drive – t her e i s a g rea t “ FAQ ” on t h e si te – an d t o se e ot h e r D y nami c m od e ls.

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